Greubel Forsey GMT Earth Titanium (Final Edition)

Greubel Forsey During Geneva Watch Days 2021, Greubel Forsey launched the third and final interpretation of its GMT Earth. Made of titanium, this intense black version is a limited edition of 11 pieces.

The GMT Earth by Greubel Forsey is an extraordinary wristwatch that, for the first time, makes it possible to appreciate the entirety of the world in a single glance.

This technical feat first appeared in 2011. At the time of the first “GMT”, the Earth was not yet fully revealed. Seven years later, the design of the Earth was finally complete: visible from all angles in its new sapphire alcove, it appears as though it is floating in space. On the front as well as the back, the laser-engraved Earth shows world times that are both quick and easy to read.

The first version of the GMT Earth was in white gold. The second was in platinum. Now, this timepiece is available with a new titanium case. The GMT Earth in titanium will be available in a limited edition of 11 pieces, three times less than the original version. Weighing just 117g, the weight of the strap has been reduced by two-thirds. The case has lost just over a third of its weight.

Greubel Forsey GMT Earth Titanium (Final Edition)

Titanium is used not only for the entire case, but also the bridges, the GMT push-piece, the crown and the folding buckle, the latter two being the components most exposed to shocks and scratches.

To accompany the light and matt tones of titanium, Greubel Forsey opted for a black finish on the dial. It is applied to the spotted bottom plate and to all the frosted bridges, with straight flanks, polished bevelling and countersinks. This finish is also featured on an all-black natural rubber strap, whose inner face is engraved with the cardinal values of the Greubel Forsey Atelier and which are visible on the bezel.

Greubel Forsey GMT Earth Titanium (Final Edition)

The GMT Earth displays four key pieces of information on its dial side. The first is the off-centre hours, minutes and seconds display. The first two feature large openworked hands finished with a Super-LumiNova tip, complemented by a small seconds hand on a sapphire disc at three o’clock.

On the left is the GMT indicator, whose red hand effortlessly stands out against a hand-engraved black gold disc filled with lacquer. The third, located opposite the crown, is the power reserve, designed following the same process: a black, engraved gold segment, filled with lacquer and covered by a silver-polished steel hand.

Finally between 7 o’clock and 9 o’clock, the Earth occupies the largest space, completing a full rotation in 24 hours. The engraved sapphire ring around the equator acts as a day / night indication and allows you to instantly see which hemisphere is in the daytime and which is at night.

Greubel Forsey GMT Earth Titanium (Final Edition)

Located on the side of the caseband, a final window opens to show the equator. Thanks to this, the Earth really can be seen from all angles.

Finally, on the caseback side, the worldtime display indicator completes the design. 24 time zones indicate the UTC of 24 major cities – with those that observe daylight savings on a white background.

The GMT Earth boasts Greubel Forsey’s third invention Tourbillon 24 Secondes, which uses a fast rotation speed and is set at an angle to resolve the positioning problem in relation to gravity and which is crucial for the operation of the oscillator. The 25° angle and the rapid rotation of the tourbillon cage significantly improve the chronometric performance of a system containing only one tourbillon, especially those in fixed positions.

Technical details

Model: GMT Earth

Edition
Limited edition of 11 pieces in titanium

Special features
GMT • 2nd time zone • rotating globe with universal time and day-and-night • complete and global view from northern to southern hemisphere • universal time on 24 time zones • summer and winter time • cities observing summer time • lateral window showing the equator • GMT pusher • Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve indicator

Movement

Hand-wound movement with 3 patents

Movement dimensions
• Diameter: 36.40mm
• Thickness: 11.55mm

Number of parts
• Movement: 453 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.39g

Number of jewels
• 60
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with gold mean-time screws (10mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plate
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, black treatment

Bridges
• Nickel silver, frosted with polished bevelling and countersinks, straight-grained flanks, black treatment
• Flat black polished steel tourbillon bridge, hand-polished bevelling and countersinks
• Flat black polished steel screws, blued by heat treatment

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion

Displays

Hours and minutes
Small seconds
72-hours power reserve on a sector
2nd time zone GMT
24 time zones universal time
Rotating titanium globe with universal time
Complete view from North Pole to South Pole
Summer time
Day-and-night

Exterior

Case
In titanium, with titanium plates, engraved, hand-finished with text, screwed to the caseband
Lateral window with shaped synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Three-dimensional synthetic sapphire crystal caseback, with integrated dome
Three-dimensional, asymmetrical, synthetic sapphire crystal bezel
Raised polished engraving “GMT Earth” and “Greubel Forsey” on a hand-punched background
Gold security screws
Titanium GMT pusher with raised engraving on a hand-punched background
Engraved individual number
Water-resistance: 3atm – 30m – 100ft (standard NIHS 92-20/SN ISO 22810:2010)

Case dimensions
Diameter: 45.50mm
Height: case 16.18mm
Height on synthetic sapphire dome: 18.00mm

Crown
In titanium, synthetic sapphire insert with GF logo

Dial Side
Multi-level hour-ring in synthetic sapphire, galvanic growth hour indexes, engraved and lacquered minutes and small seconds
Power-reserve and GMT indicators in gold, engraved and lacquered, circular-grained, black treatment
Rotating globe with day-and-night UTC indicator in synthetic sapphire, engraved and lacquered

Movement Side
Synthetic sapphire disc displaying city names surrounded by 2 gold rings (UTC and summer time) engraved and lacquered
Gold “summer time” plate with individual number, raised engraving
South Pole of the globe with UTC indicator, engraved and lacquered, hand matt lapped

Hands
Hours, minutes, small seconds and power-reserve in polished steel, hand-polished countersinks
2nd time zone GMT indicator, red triangle

Strap and clasp
Rubber or hand-sewn alligator
Titanium folding clasp, engraved with the GF logo

Greubel Forsey New GMT Sport with Integrated Metal Bracelet

Unveiled during the Watches and Wonders Digital exhibition in April 2021, this new GMT Sport watch in titanium is the first Greubel Forsey creation with a completely integrated metal bracelet. With a new bezel and new finishes, this spectacular timepiece comes in a limited edition of just 33 pieces.

Greubel Forsey New GMT Sport with Integrated Metal Bracelet

Taking centre stage for the first time on the GMT Sport, the distinctive Greubel Forsey bezel now subtly relieved of the relief engraved key values, takes on a completely new profile. With hand-finished horizontal straight-graining on top and the hand-polished contour and flanks taking on a soft yet striking new form, the bezel is beautifully refined, opening up the dial to attract even greater focus to the essential – the Greubel Forsey movement and hand-finishing, a characteristic of every timepiece.

This new finish highlights the unique profile of the GMT Sport’s bezel, an ellipse that gently curves at 12 o’clock and 6 o’clock to hug the contours of the wrist – a passion for perfect ergonomics that reaffirms the contemporary, everyday style of this exclusive timepiece.

Greubel Forsey New GMT Sport with Integrated Metal Bracelet

This ergonomic design is further pursued in the new bracelet of this GMT Sport – the first ever metal bracelet on a Greubel Forsey creation. Entirely conceived in the Atelier and specifically for this timepiece, it is fully integrated into the case of the GMT Sport and profiled to seamlessly follow the elliptical shape of its case and bezel.

Faithful to its tradition, Greubel Forsey has devoted particular attention to finishing with three distinct styles distributed over both the lateral and central links: straight graining, frosting and hand-polished bevelling.

Greubel Forsey New GMT Sport with Integrated Metal Bracelet

For example, frosting was chosen to echo the finish of the lugs, underlining the aesthetic continuity between the case and bracelet. The latter, made of Grade 5 titanium, is lightweight, robust and very strong. It features a fine adjustment system, providing the valuable millimetres of play to allow the wearer to choose between a loose and casual or a snug, wrist-hugging fit.

As for the movement, this new GMT Sport is the first in a unified colour: the mainplate, bridges, globe, second time zone dial and 24-second indicator ring of the Tourbillon 24 Secondes at 1 o’clock are all in the same blue finish. Both the central suspended arched bridge and the Tourbillon Bridge are open-worked to highlight the three dimensional movement architecture of its intense blue finish.

The choice on the one hand of a deep, matte blue and on the other, the polished components in titanium (bridges, globe) or steel (hands, power reserve) accentuate the strong contrasts within the movement itself and ensure perfect legibility.

Thanks to its 42mm case diameter (45mm on the bezel), the expression of the movement’s technicality is perfectly harmonious with the intuitive central hours and minutes display, second time zone at 10 o’clock, power reserve at 3 o’clock and rotating terrestrial globe at 8 o’clock.

Greubel Forsey New GMT Sport with Integrated Metal Bracelet hands on

With this new livery, more essential and refined than ever, Greubel Forsey offers a new means of expression to two of their signature creations. Their 3rd invention, the Tourbillon 24 Secondes is positioned between 12 o’clock and 2 o’clock. With its cage inclined at a 25° angle and completing a full rotation in 24 seconds, the Tourbillon 24 Secondes provides superior chronometric performance – in addition to the truly unique visual effect.

Then, the terrestrial globe placed between 7 o’clock and 9 o’clock. More than any other, it embodies the three-dimensional time display championed by Greubel Forsey. Thanks to this invention which executes a complete rotation in 24 hours, universal time can be read easily, quickly and intuitively.

Seen from above the North Pole, a ring with 24- hour markings allows the local time to be read for all longitudes while also acting as a day/night indication. On the caseback side, a disc displaying city names surrounded by 2 rings allows the wearer to read UTC Universal and Summer Time for 24 cities in 24 major time zones. It also distinguishes those time zones applying summer time (on a light background) from those who don’t (on a dark background).

Technical details

Model: GMT Sport
In titanium, blue movement
Limited edition

Movement
Hand-wound movement with 3 patents • Patents pending
GMT • 2nd time zone • rotating globe with universal time and day-and-night • universal time on 24 time zones • summer and winter time • cities observing summer time • GMT and Earth pushers • Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement dimensions
• Diameter: 36.90mm
• Thickness: 13.18mm

Number of parts
• Movement: 435 parts
• Tourbillon cage: 88 parts
• Weight of the cage: 0.38g

Number of jewels
• 63
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with gold mean-time screws (10mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Bridges and main plate
• Titanium
• Frosted and spotted, polished bevelling and countersinks, straight-grained flanks, blue treatment
• Multi-level, open-worked and polished suspended-arch bridge, polished bevelling and countersinks, straight-grained flanks
• Open-worked flat black polished tourbillon bridge, spotted, polished bevelling and countersinks, straight-grained flanks

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and on escape wheel pinion
• Inclined gear and profiled teeth on intermediate wheels of the sethands mechanism.

Displays
• Hours and minutes, on suspended-arch bridge
• Small seconds on disc
• 72-hours power reserve on a sector
• 24-seconds tourbillon rotation
• Rotating titanium globe with universal time
• Day-and-night
• 2nd time zone GMT
Movement side
• 24 time zones universal time
• Summer time

Exterior

Case
• Titanium with curved synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped bezel, hand-polished with hand-finished straight graining
• Profiled lugs, screwed fixing
• Engraved pushers
• Transparent back with high domed synthetic sapphire crystal
• Titanium security screws
• Raised engraving “GMT Sport” and “Greubel Forsey”

Case dimensions
• Caseband diameter: 42.00mm
• Bezel diameter: 45.00mm
• Case height: 15.70mm
• Height on synthetic sapphire crystals: 17.80mm
• Water-resistant 10atm – 100m – 328ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
• Titanium and rubber with GF logo
• Colour-coded rubber capping, interchangeable

Dial

Front side
• Three-dimensional, variable geometry hour-ring, with luminescent hours and minutes indexes
• GMT indicator with raised engraving
• Power-reserve indicator, engraved and lacquered
• Tourbillon rotation indicator in gold
• Rotating globe with fixed day-and-night UTC indicator in synthetic sapphire, engraved and lacquered

Movement Side
• Synthetic sapphire disc displaying city names surrounded by 2 rings (UTC engraved on the case / Summer time engraved on a gold movement plate, lacquered and hand matt-lapped)
• “Summer time” plate with limitation number, raised engraving, hand matt lapped

Hands
Hours and minutes, curved profile, polished steel with Super-Luminova
2nd time zone GMT indicator, grey triangle
Small seconds, fixed red triangle
Power-reserve indicator, in polished steel
Aluminium 24-seconds double-tipped hand, black treatment

Strap and clasp
Rubber with text in relief, titanium folding clasp, engraved GF logo
3-row metal bracelet in titanium, folding clasp with integrated fine adjustment, engraved GF logo

Greubel Forsey GMT Quadruple Tourbillon Titanium Limited Edition

The GMT Quadruple Tourbillon by Greubel Forsey is now available in a titanium version. Limited to 11 pieces, this ground breaking horological marvel incorporates new materials, new colours and new finishes.

Greubel Forsey GMT Quadruple Tourbillon Titanium Limited Edition

The Quadruple Tourbillon is Greubel Forsey’s second Fundamental Invention and it averages out positional errors due to gravity in all situations, especially in stable wristwatch positions. To achieve this, the original tourbillon has been elevated to realise its full potential: inclined at 30°, doubled and then quadrupled.

The result, two synchronised Double Tourbillon 30° mechanisms, where a first cage, inclined at 30° and rotating in one minute, is nested within a second horizontal cage, completing a full rotation in four minutes. A spherical differential transmits the average timing rate of the four tourbillon cages, improving the overall chronometric performance of all the regulating organs.

Greubel Forsey GMT Quadruple Tourbillon Titanium Limited Edition

The 46.5mm case of the GMT Quadruple Tourbillon is made of titanium, which is both stronger and lighter than steel, while also being extremely resistant to corrosion and magnetic fields. This exclusive limited edition in titanium with striking blue accents ensures modern and dynamic feel on the wrist.

Greubel Forsey GMT Quadruple Tourbillon Titanium Limited Edition

The toughness of titanium presents a significant machining and hand finishing challenge for the components made from it, such as the GMT pusher or the folding clasp or the crown. In addition, new hand finishing details have been specially created for this timepiece.

The circular-grained hour ring with polished bevels and 72-hour chronometric power reserve indication appear for the first time in a brilliant blue. The mainplate is now frosted and spotted with polished bevelling, countersinks and straight-grained flanks, executed in a grey finish.

Greubel Forsey GMT Quadruple Tourbillon Titanium Limited Edition

Set near eight o’clock, the rotating terrestrial globe in blue livery offers the simultaneous display of several different time zones: on the dial side, with a 24-hour ring around the Earth, for Day/Night indication and on the caseback side, displaying 24 major cities their respective time zones while distinguishing between those which use summer time (on a light coloured backdrop), and those which do not (on a dark backdrop).

Greubel Forsey GMT Quadruple Tourbillon Titanium Limited Edition

The sapphire crystal window around the equator completes the timepiece, offering a complete view of the Earth in motion, with its continents immersed in the deep blue ocean waters, complementing the exquisite blue finish of the power reserve, hour circle and strap.

Greubel Forsey GMT Quadruple Tourbillon Titanium Limited Edition

Technical details

Model: GMT Quadruple Tourbillon
Edition: 11 pieces in titanium

Movement

Hand-wound movement with 3 patents

Movement dimensions
• Diameter: 39.50mm
• Thickness: 13.00mm

Number of parts
• Movement: 705 parts
• Four tourbillon cages: 260 parts
• Total weight of the cages: 2.25g
• Spherical differential: 28 parts

Number of jewels
• 84
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Three series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with white gold mean-time screws (10.70mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, grey treatment

Bridges
• Nickel silver, frosted and spotted, polished bevelling and countersinks, straight-grained flanks, grey treatment
• Gold plate engraved with the individual number
• Flat black polished gold plates with relief engraved text, polished bevelling and countersinks, straight-grained flanks
• Four flat black polished steel tourbillon bridges, hand-polished bevelling and countersinks, straight-grained flanks

Inner tourbillons
• Inclined at a 30° angle, 1 rotation per minute

Outer tourbillons
• 1 rotation in 4 minutes
• Hand-bevelled and open-worked cage pillars
• 1 gold counterweight per double cage bearing the individual number of the timepiece

Gearing
• Involute circle profile
• Conical gearing with profiled teeth

Displays
• Hours and minutes
• Small seconds (mean performance)
• 72-hours power reserve on a sector
• 2nd time zone GMT
• 24 time zones universal time
• Rotating titanium globe with universal time
• Cities observing summer time
• Day-and-night

Exterior

Case
• In titanium with asymmetrical convex synthetic sapphire crystal
• Transparent back with asymmetrical convex synthetic sapphire crystal
• Lateral window with shaped synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped lugs
• Raised polished engraving “GMT Quadruple” and “Greubel Forsey” on a hand-punched background
• Gold security screws
• Polished bezel, caseband with hand-finished straight graining
• Titanium GMT pusher with raised engraving on a hand-punched background
• Engraved individual number

Case dimensions
• Diameter: 46.50mm
• Height: 17.45mm

Water resistance of the case
• Water-resistant 3atm – 30m – 100ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
• In titanium with engraved GF logo

Dial
• Multi-level in gold, anthracite colour
• Gold hour-ring and power reserve, circular-grained with polished bevelling, blue treatment
• Gold hour markers
• GMT in gold, hand matt lapped
• Small second, circular-grained

Hands
• Hours and minutes in polished gold, with Super-LumiNova
• Small seconds in polished steel, black treatment
• Power-reserve in polished steel, hand-polished countersink
• 2nd time zone GMT indicator, red

Strap and clasp
• Rubber or hand-sewn alligator
• Titanium folding clasp, engraved with the GF logo

Greubel Forsey Balancier Contemporain in 5N Red Gold

In 2019, Greubel Forsey opened a new chapter in its history by presenting the particularly compact Balancier Contemporain, the first Greubel Forsey timepiece with a diameter of 39.6mm. Embodying all the codes of Greubel Forsey, exploring all three dimensions in detail without ever compromising on chronometric performance, the Balancier Contemporain is a real tour de force. Following the initial white gold version, it is now offered in a new 5N red gold case with a rich, multi-level contrasting dial.

Greubel Forsey Balancier Contemporain in 5N Red Gold

Composed of 255 parts, all created and hand finished in the Greubel Forsey spirit of fine craftsmanship, the Balancier Contemporain represents a true architectural accomplishment. The movement has been created especially to fit the specified dimensions, the challenge being not only to house the large balance wheel within a small space, but also more importantly to achieve a harmonious creation with optimal proportions, crafted with precise attention to detail. The 5N red gold version of the Balancier Contemporain plays on the differences in levels, materials, volumes and finishes, while perfectly illustrating the world of Greubel Forsey.

At 6 o’clock, the large balance wheel – developed and built entirely within the Greubel Forsey Atelier – catches the eye. Its impressive 12.6mm diameter gives it optimal performance. It is reflected against the backdrop of a black-polished gold plate, reinforcing the sense of depth to the movement. The regulating organ is equipped with a balance wheel stop function that can be activated by pulling the crown. The six gold adjustable screws have been placed inside the felloe to allow for a very precise adjustment, thereby limiting air friction and any resulting disturbance, ultimately providing improved results, better chronometric performance and easier adjustment.

Greubel Forsey Balancier Contemporain in 5N Red Gold

With a diameter of only 39.6mm and a height of 12.21mm, the proportions of the Balancier Contemporain make it particularly unique, especially as Greubel Forsey timepieces usually have a larger diameter. The red gold case is enhanced by three-dimensional variable geometry-shaped lugs that create subtle and elegant curves. These unique proportions are accentuated by contrasting finishes: a fully polished bezel and lugs, with a satin-brushed caseband and caseback. Above the bezel, the high-domed sapphire crystal adds further depth to the movement.

The Balancier Contemporain takes us on an architectural voyage several stories high. The journey begins with a black polished gold plate where the balance wheel takes pride of place at 6 o’clock. Higher up, a frosted and bevelled bridge reveals the barrel drum with Greubel Forsey engraving. At 8:30, the small seconds hand moves on a slightly higher level. Higher up still, a delicate hand-frosted bridge displays the 72-hour power reserve, which is brought to life by a slender blued steel hand.

Further east, at 2 o’clock, the contrasting colours accentuate the temporal indications, and the off-centre position of the hour/minute dial is accentuated by the anthracite finish of the minute circle. Positioned on a raised tripod bridge, the hours and minutes are displayed by two blued steel hands with a hand-polished flat surface and countersinks. The voyage ends with an opening in the dial that allows a glimpse of the large balance wheel, with its bevelled and black-polished bridge.

Greubel Forsey Balancier Contemporain in 5N Red Gold

The caseback of this timepiece reveals a true work of art created with all the mastery of traditional artisanal hand finishing of Greubel Forsey timepieces. A circular engraved red gold disc is displayed in the centre, surrounded by a white gold bridge, which features the Atelier’s key values written in engraved and black-polished letters, along with the characteristic olive-domed jewels set in gold chatons.

The Balancier Contemporain in 5N red gold takes us on a fascinating architectural journey, where three-dimensionality is explored on every level. The unique architecture is showcased through the greatest attention to detail and expert hand finishing. With its unique proportions, the Balancier Contemporain is a culmination of expertise encapsulating the whole Greubel Forsey universe.

Technical details

Model: Balancier Contemporain In 5N red gold

Movement
Hand-wound movement

Movement dimensions
• Diameter: 32.40mm
• Thickness: 9.20mm

Number of parts
• Movement: 255 parts

Number of jewels
• 33
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Barrel with relief engraving “Greubel Forsey”

Balance wheel
• In-house variable-inertia with 6 gold mean-time screws (12.60mm diameter)
• Stop balance activated by crown

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Titanium, frosted and spotted, straight-grained flanks

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Power-reserve bridge with galvanic growth
• Flat black polished steel balance wheel bridge, hand-polished bevelling and countersinks, straight-grained flanks
• Flat black polished gold plate under the balance wheel, polished bevelling and countersinks, straight-grained flanks
• Flat black polished gold plate on the movement side with relief engraved text, polished bevelling and countersinks, straight-grained flanks with apparent gold chatons
• Central gold plate, “GF” engraved with the individual number

Gearing
• Involute circle profile

Displays
Hours and minutes
Small seconds
72-hours power reserve on a sector

Case
In 18k 5N red gold with high domed synthetic sapphire crystal
Transparent back with high domed synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Raised polished engraving “Balancier” and “Greubel Forsey” on a hand-punched background
Gold security screws
Hand-polished bezel, caseband with hand-finished straight graining
Hand-engraved individual number
Diameter: 39.60mm
Height: 12.21mm
Water resistance: 3atm – 30m – 100ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
In 18k 5N red gold with engraved and black lacquered GF logo

Dial
Multi-level in gold, rhodium-coloured, black minute-circle, with a visual opening for the balance wheel, polished bevel
Small seconds in gold, rhodium-coloured, polished bevel
Power-reserve in gold, engraved and black lacquered, hand matt lapped

Hands
Hours and minutes, small seconds and power-reserve in polished blued steel, hand-polished countersinks

Strap and clasp
Hand-sewn alligator
In 18k 5N red gold pin buckle, hand-engraved with the GF logo

Greubel Forsey signs partnership with Spanish retailer Chocrón Joyeros

Greubel Forsey and Chocrón Joyeros join forces in a brand new exclusive partnership in the Spanish market. Founded over seven decades ago, Chocrón Joyeros is a globally recognized retailer with the same spirit of innovation found in each Greubel Forsey creation. The two houses, united in their passion for fine watchmaking, share a common philosophy that guides them in their everyday quest for excellence.

Three exclusive timepieces will be exhibited in the prestigious Madrid boutique, located in the Salamanca district. Among them, the GMT Earth and its rotating terrestrial globe, which allows an extraordinary spatial vision of our Planet Earth. Aficionados will also be able to discover the Tourbillon 24 Secondes Contemporain as well as the Signature 1.

Founded in 1948 by D. Carlos Chocrón at just 18 years of age, Chocrón Joyeros has embodied for more than seven decades the values of excellence and tradition in fine watchmaking. In its stores in Madrid, Marbella and Ceuta, the house shares its expertise and know-how passed down through four generations, offering innovative objects of the highest quality.

The experience gained over the years has allowed Chocrón Joyeros to gain international recognition while keeping its Spanish roots. With Moisés Chocrón at its head, the house is recognized around the world for its professionalism and discretion.

Greubel Forsey BALANCIER S (In Titanium)

In 2019, Greubel Forsey introduced the GMT Sport featuring a totally new case architecture with sculptural lines combining ergonomics, robustness and comfort. Continuing their passion to explore new paths, inventive watch makers Robert Greubel and Stephen Forsey presents their new sporty creation, BALANCIER S in Titanium.

The BALANCIER S timepiece offers a new interpretation of the unique case displaying its completely new movement. Circular from above, this case reveals the unique arched ovoid shape from other angles, features integrated lugs and strap, and a satin-finished bezel engraved with Greubel Forsey’s key values. The new “Balancier S” achieves a slim profile, reinforcing its dynamic new momentum.

Greubel Forsey BALANCIER S (In Titanium)

The rubber crown and caseband with rubber inserts assure excellent grip and protection of the timepiece. The oval, arched sapphire crystal follows the curvature of the case. The perfect osmosis between the case and the movement is emphasized, technically and visually, by a daring double suspended arched bridge holding an inclined gear train and curved central hour and minute hands. These striking elements integrate and extend over the inclined balance wheel giving the timepiece its powerful identity, but also assuring its outstanding chronometric performance.

Greubel Forsey BALANCIER S (In Titanium)

The large inclined balance wheel at 7 o’clock stands out. Aiming above all to improve chronometry, it maximises the space offered by the arched case and sapphire crystal, inextricably linking form and function. In their relentless quest for precision and performance, Robert Greubel and Stephen Forsey have already challenged chronometry, notably by reinventing the tourbillon mechanism with the Tourbillon 24 Secondes, Quadruple Tourbillon and the Double Tourbillon 30°. They chose a new approach here, based on their large balance wheel unveiled in 2016.

Entirely developed and made within the Greubel Forsey Atelier, this balance wheel is distinguished by its oversized 12.6mm diameter, ensuring excellent timekeeping performance. To allow fine timekeeping adjustment of the moment of inertia, the balance wheel rim is fitted with six gold regulating screws, inset so as to limit air friction. In this new hand wound calibre, with several patents pending, the imposing Greubel Forsey balance wheel can be seen in an inclined construction for the very first time.

Greubel Forsey BALANCIER S (In Titanium)

This 30° angle with respect to the horizontal plane of the movement proves to be an outstanding solution for limiting timing errors due to the effects of gravity on the regulating organ (balance wheel, spring and escapement) in stable positions. Combined with the large diameter of the balance wheel and the frequency of 21,600 vibrations/hour, it provides this timepiece with excellent chronometric performance – it’s also prominently visible in action due to the unique movement architecture.

With two coaxial barrels mounted in series, the 308- component movement has a 72-hour chronometric power reserve, indicated on a sector at 2 o’clock using an open-worked red-tipped hand. The central hours and minutes display, with profiled and open-worked polished steel hands, is completed by a small seconds hand on the inclined plane of the escapement at 8 o’clock, accentuating the depth and relief of this new calibre.

Greubel Forsey BALANCIER S (In Titanium)

Following the Greubel Forsey creative spirit, technical and architectural innovation is accomplished with unconditional care and craftsmanship for all the components of the movement. This traditional and irreplaceable artisanal know-how is mastered in the Greubel Forsey Atelier – frosting, polished bevels and countersinks, circular and straight graining highlight even the smallest surfaces.

The use of titanium for the mainplate and bridges proved much more difficult for manual hand-finishing than steel or even nickel silver and further increases the technical and aesthetic challenge that this timepiece represents.

Greubel Forsey BALANCIER S (In Titanium)

Made of titanium and water resistant to 100 metres, the sport and powerful case shape of the Balancier S is distinguished by its lightness and comfort on the wrist. Its robustness protects the movement, in particular its large balance wheel, tested in the Greubel Forsey EWT Laboratory assuring its reliability and chronometric performance at all times. The flexible and resistant rubber strap reinforces the sporty dimension, with all the comfort of a titanium folding clasp.

Technical details

Model: Balancier S (In titanium)

Movement
Hand-wound movement • Patents pending
Timepiece with four hands • hours and minutes • small seconds power-reserve • 30° inclined GREUBEL FORSEY balance wheel system

Displays
• Hours and minutes, on suspended arch bridge
• Small seconds
• 72 hours power reserve on a sector

Exterior

Case
• Titanium with curved synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped bezel with raised engraved text
• Profiled lugs, screwed fixing
• Caseband with rubber
• Transparent back with high domed synthetic sapphire crystal
• Titanium security screws
• Raised engraving “Balancier Incliné” and “Greubel Forsey”

Case dimensions
• Caseband diameter: 43.00 mm
• Bezel diameter: 45.00 mm
• Case height: 13.75 mm
• Height on synthetic sapphire crystals: 15.60 mm
• Water-resistant: 10 atm – 100 m – 328 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
• Titanium and rubber with GF logo
• Colour-coded rubber capping, interchangeable

Dial side
• Three-dimensional, variable geometry hour-ring, with lacquered hours and minutes indexes
• Power-reserve indicator, engraved and lacquered
• Gold small seconds dial, rhodium-coloured, polished bevel

Hands
• Hours and minutes, curved profile, polished steel
• Small seconds, red finish
• Power-reserve in polished steel, flat black polished head

Strap and clasp
• Rubber with text in relief
• Titanium folding clasp, engraved GF logo

Movement specifications

Movement dimensions
• Diameter: 37.00 mm
• Thickness: 10.62 mm

Number of parts
• Movement: 308 parts
• Escapement platform: 68 parts

Number of jewels
• 42
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Relief-engraved text, circular-grained, black treatment, polished chamfer

Balance wheel
• In-house variable-inertia with 6 gold mean-time screws (12.60 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Bridges and main plate
• Titanium
• Frosted, polished bevelling and countersinks
• Multi-level, suspended-arch bridge, polished with black treatment in relief, polished beveling and countersinks
• Movement side, frosted bridges, polished edges and bevelling
• Gold plate with engraved limitation number, circular-grained, polished bevelling and countersinks, straight-grained flanks

Escapement platform
• Inclined at a 30° angle
• Titanium, frosted, polished countersinks, large straight-grained inclined facet, black treatment
• Multi-level, titanium balance wheel bridge, polished with black treatment in relief, polished bevelling and countersinks

Gearing
• Involute circle profile
• Inclined gear and profiled teeth on intermediate wheels of the set hands mechanism and small seconds

Greubel Forsey QP À ÉQUATION in 5N Red Gold Millesime with Chocolate Gold Dial

Following the GPHG (Grand Prix d’Horlogerie de Genève) award for the best Calendar Prize, Greubel Forsey presents its QP à Équation in a 5N red gold millesime with a chocolate coloured gold dial.

This reinvention of the perpetual calendar integrates the Equation of Time into the perpetual calendar, as well as bringing practical new functions and indications that improve clarity. The priority was to simplify a complete perpetual calendar display and yet make it much easier to set by simply using the bidirectional crown. Despite the numerous indications and functions, Greubel Forsey’s Mechanical Computer is as easy to set as a simple date feature.

Greubel Forsey QP À ÉQUATION in 5N Red Gold Millesime with Chocolate Gold Dial

To meet this technical challenge Greubel Forsey invented a sophisticated coding mechanism: the patented Mechanical Computer. A stack of cams with movable fingers shift the indications on the dial and caseback of the timepiece and the complete mechanism is fully integrated within the movement. The month’s cam changes the month, displayed in a window on the front and also moves the Equation of Time disc on the back. The years’ cam controls the leap year indication on the front and also the millesime and seasons on the back. The development of this coding device not only overturns the conventional way of setting the indications but also displays them simultaneously on both dial and caseback.

Greubel Forsey QP À ÉQUATION in 5N Red Gold Millesime with Chocolate Gold Dia

Just a glance at the calendar display clearly reveals the three in-line windows that clearly indicate the day, the date and the month. The large date makes the calendar extremely legible.

The dial side of the QP à Équation indicates leap years, the 24 hours of the day and night, the day of the week, the large date, the month, the hours, the minutes and the seconds, as well as the 72-hour chronometric power reserve. On the movement side, this timepiece displays the Equation of Time with the months, seasons, solstices and equinoxes, as well as the calendar year.

Greubel Forsey QP À ÉQUATION in 5N Red Gold Millesime with Chocolate Gold Dial

Horology seeks to measure time as regularly as possible; however the Earth orbits the Sun in an elliptical path. As the Earth sweeps close past the Sun, the period between successive solar zeniths, or the solar day’s length, changes. This causes the two sides showing 15 indications difference between solar time and mean time to vary from a few seconds to as much as 16 minutes during the year. The Equation of Time is the conversion factor between solar and mean time. To read solar time, simply look at the back subdial for the displayed date’s Equation of Time.

Its case back showcases fine hand finishing, and also provides a new way to tell the time. The most frequently sought calendar information, namely the day, date and month, is displayed on the inline main dial display. Information that is less often required is visible on the back of the timepiece. Thus the two sides show indications that you need to know regularly on the front, and indications accessed less frequently on the back.

Greubel Forsey QP À ÉQUATION in 5N Red Gold Millesime with Chocolate Gold Dial

The timekeeping performance comes from Greubel Forsey’s third invention: the Tourbillon 24 Secondes, with its unique fast rotational speed and inclined angle to solve the problem of critical positions of the oscillator in relation to gravity. A 25° angle and the rapid revolution of the tourbillon cage significantly improve the chronometric performance of a system containing only one tourbillon, especially in stable positions.

The multi-level chocolate-coloured gold dial of this millesime edition timepiece contrasts harmoniously with the 5N red gold case and underlines the intuitive linear calendar display.

Technical details

Model: QP à Équation
In 5N red gold – Millésimé
Chocolate-coloured dial

Movement
Hand-wound movement with 4 patents
Bidirectional perpetual calendar • day, date, month, calendar year, leap year, day/night • equation of time with month, season, solstice and equinox • function selector •
Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 9.60 mm

Number of parts
• Movement: 624 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.37 g

Number of jewels
• 75
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• 4 engraved gold plates, one with the individual number
• Flat black polished steel tourbillon bridges
• Synthetic sapphire mechanical computer bridge

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion

Dial displays
Hours and minutes
Small seconds
72-hours power reserve on a sector
Day of the week, large date and month
Leap year
Day-and-night with red safety zone
Function selection (perpetual calendar or H/M time adjustment)

Back displays
Equation of time with month, season, solstice and equinox
Calendar year

Case
In 5N red gold with asymmetrical convex synthetic sapphire crystal
Diameter: 43.50 mm
Height: 16.00 mm
Transparent back with asymmetrical synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Raised polished engraving “QP à Équation” and “Greubel Forsey” on a hand-punched background
Gold security screws
Polished bezel, caseband with hand-finished straight graining
Hand-engraved individual number
Water resistance of the case: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
In 5N red gold with engraved GF logo

Dial
Multi-level gold dial, chocolate-coloured
Gold hour markers
Small second, power-reserve
Leap year in polished steel, black treatment
Gold perpetual calendar aperture with polished raised engraving
Gold GF logo

Hands
Hours and minutes in polished gold with Super-LumiNova
Small seconds, power-reserve in polished gold
Leap year in polished steel, black treatment

Strap and clasp
Hand-sewn alligator
5N red gold folding clasp, hand-engraved with the GF logo

 

Greubel Forsey GMT Sport Titanium Limited Edition

With their brand new GMT SPORT timepiece, Robert Greubel and Stephen Forsey have pushed back the limits of ergonomics and wrist comfort. They have invented a totally new case form, perfectly round from above, while revealing the accentuated arched and ovoid shape from other angles.

The aerodynamics of this timepiece 4 patents are reinforced by its integrated lugs and strap resulting in distinct functional forms that perfectly ft any wrist. The sweeping satin finished bezel with Greubel Forsey’s values relief engraved on its outer bevel, follows this unique case shape. The curved profile of the 45 mm diameter case and ovoid sapphire crystal provide the perfect showcase for an entirely new movement architecture with an arched bridge and inclined gear train.

Greubel Forsey GMT Sport Titanium Limited Edition

Already in 2015, the GMT Black paved the way for the GMT Sport. Building on this foundation, Robert Greubel and Stephen Forsey have invented and now present the result, a lightweight and ultra-strong, profiled titanium case with ovoid bezel and integrated lugs to showcase the new movement. Water resistant to 100 meters, the new GMT Sport stands out as their most sport oriented timepiece to date.

Greubel Forsey GMT Sport Titanium Limited Edition

The movement was constructed from scratch – from the suspended arched bridge for the hours and minutes display, to the unique showcase of the Tourbillon 24 Secondes and the universal time display with three-dimensional globe.

Greubel Forsey GMT Sport Titanium Limited Edition

The display side of the GMT Sport presents classic Greubel Forsey architecture, an open, orchestrated theatre between suspended bridges, semi-apparent wheels and floating dials in three dimensions. In keeping with the sporting vocation of this timepiece, the focus is on legibility and efficiency. The hours and minutes are displayed by concentric open-worked hands whose curved profile follows the curvature of the case and movement.

Greubel Forsey GMT Sport Titanium Limited Edition

Mounted on the suspended arch centre bridge with black treated openings, the gear train literally follows the curve of the bridge, overlooking the globe to drive the hour and minute hands. Ensuring excellent visibility in the dark, the triangular tips of the arrow-shaped hands and the markers on the minute-hour-ring are enhanced with luminescent coating.

Suspended three-dimensional displays and 11 o’clock combines the small seconds on a large rotating disc, and the second time zone display with a hand. These two coaxial displays with red triangular indexes underline this timepiece’s technicity. The 72-hour chronometric power reserve (ensured by two coaxial barrels in series) is indicated on a sector at 3 o’clock with its open-worked hand and highlighted red triangle. Housed underneath the arched bridge, the power reserve differential is subtly engraved with Greubel Forsey’s values. Whether they are visible on the dial side or concealed in the caseback side, each of the 435 components of this hand-wound movement, including titanium plates and bridges, respect the most demanding criteria of the Greubel Forsey Atelier and the teams utmost concern for the finest workmanship.

Greubel Forsey GMT Sport Titanium Limited Edition

The 24 Seconds Tourbillon is showcased at 1 o’clock secured by its distinctive and highly polished tourbillon bridge with black finished openings. This third Fundamental Invention by Greubel Forsey in the field of the tourbillon (after the Double Tourbillon 30 ° and the Quadruple Tourbillon) stands out with its cage inclined at 25 ° completing one full rotation in 24 seconds.

The faster speed combined with the inventive cage inclination, significantly improves chronometric performance in a single-tourbillon system, with minimal movement height. This exclusive and patented configuration counters the disturbances induced on the movement by earth’s gravity, especially in stable positions. The rotating tourbillon cage housing the regulating organ has 88 components, for a weight of 0.38 grams – a feat made possible in particular by light alloy pillars and titanium bridges.

Precision and reliability summarise Greubel Forsey’s ground-breaking GMT mechanism, presented for the first time in 2011, with the GMT Black presented in 2015.

In this double-patented mechanism, the second time zone indication on the auxiliary dial between 10 and 11 o’clock is combined with a universal time display to intuitively read the current time anywhere in the world.

The remarkable innovation and striking spectacle of the terrestrial rotating globe – seen from above the North Pole – performs each complete anticlockwise turn on its axis in 24 hours. It’s surrounded by a sapphire crystal ring with 24-hour divisions; where the wearer can read local time for all longitudes, including the day / night indicator (light zone / dark zone).

Caseback view of Greubel Forsey GMT Sport Titanium Limited Edition

On the caseback side of the GMT Sport, outer and central rings complete the sapphire cities disc to give UTC Universal and Summer Time for 24 cities in major time zones. This disc distinguishes those time zones applying summer time (on a light background) from those that do not (on a dark background).

Reviewing the ergonomics, the GMT’s functions use two pushers located on the left side of the case; one to select the second time zone and the other for synchronising the local time with the globe. The titanium and rubber crown also ensures optimum setting.

Greubel Forsey GMT Sport Titanium Limited Edition

Created in a limited edition of 11 pieces, the GMT Sport with the key Greubel Forsey values in relief on the bezel has a black or blue rubber strap. A titanium folding clasp reinforces the comfort and ergonomics of this Greubel Forsey timepiece.

Technical details

Model: GMT Sport In Titanium, Limited edition

Special features
Hand-wound movement with 3 patents • Patents pending
GMT • 2nd time zone • rotating globe with universal time and day-and-night • universal time on 24 time zones • summer and winter time • cities observing summer time • GMT and Earth pushers • Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement

Movement dimensions
• Diameter: 36.90 mm
• Thickness: 13.18 mm

Number of parts
• Movement: 435 parts
• Tourbillon cage: 88 parts
• Weight of the cage: 0.38 g

Number of jewels
• 63
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Bridges and main plate
• Titanium
• Frosted and spotted, polished bevelling and countersinks, straight-grained flanks, black treatment
• Multi-level, suspended-arch bridge, polished with black treatment in relief, polished beveling and countersinks, straight-grained flanks
• Flat black polished tourbillon bridge with black treatment in relief, spotted, polished bevelling and countersinks, straight-grained flanks

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and on escape wheel pinion
• Inclined gear and profiled teeth on intermediate wheels of the set-hands mechanism.

Displays

• Hours and minutes, on suspended-arch bridge
• Small seconds on disc
• 72-hours power reserve on a sector
• 24-seconds tourbillon rotation
• Rotating titanium globe with universal time
• Day-and-night
• 2nd time zone GMT
Movement side
• 24 time zones universal time
• Summer time

Exterior

Case
Titanium with curved synthetic sapphire crystal
Three-dimensional, variable geometry-shaped bezel with raised engraved text
Case-band diameter: 42.00 mm
Bezel diameter: 45.00 mm
Case height: 15.70 mm
Profiled lugs, screwed fixing
Engraved pushers
Transparent back with high domed synthetic sapphire crystal
Titanium security screws
Raised engraving “GMT Sport” and “Greubel Forsey”
Height on synthetic sapphire crystals: 17.80 mm
Water-resistant 10 atm – 100 m – 328 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
Titanium and rubber with GF logo
Colour-coded rubber capping, interchangeable

Dial side
Three-dimensional, variable geometry hour-ring, with luminescent hours and minutes indexes
GMT indicator with raised engraving
Power-reserve indicator, engraved and lacquered
Tourbillon rotation indicator in gold
Rotating globe with fixed day-and-night UTC indicator in synthetic sapphire, engraved and lacquered

Movement side
Synthetic sapphire disc displaying city names surrounded by 2 rings (UTC engraved on the case / Summer time engraved on a gold movement plate, lacquered and hand matt-lapped)
“Summer time” plate with limitation number, raised engraving, hand matt lapped

Hands
Polished steel curved shape hours and minutes, with Super-LumiNova
2nd time zone GMT indicator, red triangle
Small seconds, fixed red triangle
Power-reserve indicator, in polished steel
Aluminium 24-seconds double-tipped hand, black treatment

Strap
Rubber with relief text
Titanium folding clasp, engraved GF logo

Greubel Forsey HAND MADE 1

Before the Industrial Revolution and the advent of mass production, watch components had to be made one by one requiring very specific skills, tools and completely hand-operated machines. Today, with industrialization, excellence in hand craftsmanship has virtually disappeared and these skills are not even taught in schools.

Proudly displaying their expertise in true hand-watchmaking, Greubel Forsey presents Hand Made1, a horological masterpiece that revives ancient techniques, forgotten gestures and skills.

Hand Made 1 is an hours/minutes/seconds timepiece with a tourbillon. This creation took an uncharted course because simply replicating an existing calibre by hand was out of the question. The Hand Made 1 has been entirely created from scratch. The movement construction, traditional machining and hand-finishing specialists reflected at length on each of the 272 movement components and 36 case parts, understanding and concentrating on what the hand-made approach allows and how to get the very best out of it.

The Hand Made 1 therefore demanded a total overhaul of the creative process, involving the people who would make and decorate each component from the very beginning. This project’s daring was only matched by the creativity and inventiveness required to find new technical solutions. Some parts of the movement were redesigned in order to simplify them. Meanwhile for other mechanisms such as the tourbillon, the number of components had to be increased to allow each part to be made by hand. The timepiece’s relatively modest dimensions (43.5 mm in diameter and 13.5 mm thick) further heightened the difficulty of this task.

A landmark in the history of watchmaking, Hand Made 1 by Greubel Forsey, is an entirely handmade timepiece, from the movement to the case, to the leather strap, the dial and the hands –the only exceptions being the sapphire crystals, the case gaskets, the spring bars, the jewels, and the mainspring.

With 95% of this timepiece – including the hairspring – made using only hand-operated tools, Hand Made 1 by Greubel Forsey takes traditional watchmaking to a new unprecedented summit. Never before has a hand-made timepiece exhibited such a high level of workmanship and precision. This timepiece, unique in the history of watchmaking, is the fruit of a technical and human endeavour of epic proportions, enlisting extraordinary talents and setting the course for the future.

To achieve the 95% handmade level with such a high standard of excellence required an astronomical 6,000 hours of work for one single timepiece – the equivalent of three years man-hours, where this total time only takes into account the pure watchmaking – and not the creation and development time.

To obtain the 308 components of the Hand Made 1 respecting Greubel Forsey criteria, over 800 individual parts had to be made. It took almost 35 times longer to make the complete tourbillon cage than for a standard high-end tourbillon. When just a dozen operations on an automatic lathe effortlessly yield some 500 screws, a single screw, as small as it may be, requires up to 12 individual operations taking up to 8 hours to make just one.

Finally to hand make one wheel of the Hand Made 1 takes 600 times longer than that of a high-end industrial wheel. Greubel Forsey’s attention to detail naturally includes the performance of the timepiece. Here, Hand Made 1 displays unprecedented prowess for a hand-made watch, its performance certified by Greubel Forsey.

In this unique endeavour of Greubel Forsey’s handmade craftsmanship, each component tells a tale. It has its own development process and journey that makes it unique, undergoing long hours of cutting from the raw material guided only by the eye and the human hand. The technical and aesthetic perfection of this Hand Made 1 timepiece is immediately visible and in true Greubel Forsey style, it attributes equal importance to the invisible beauty of all the parts concealed inside the case.

The journey begins with the regulating organ, entirely produced by hand in Greubel Forsey’s workshops, including the balance spring, fashioned from an alloy in the Atelier. The balance spring is then rolled in a hand operated rolling mill (without computer assistance), a process that is certainly an endangered know how – only a few balance springs can be made at a time – whereas in contemporary industrial production, hundreds or thousands are automatically produced at once. The balance wheel is also entirely hand-made with an extraordinary standard of precision and finish.

The escape wheel, with its 20 individually-cut teeth, each with four surfaces that are later ground, is a true tour de force. Meanwhile the machining and finishes of the escape lever alone require a month and a half of work.

The hand making of the tourbillon carriage – with its 69 components weighing a total of 0.521 g – represented another sizeable challenge, as it is not possible to replicate the same geometry of a CNC machine on a traditional jig borer. An increased number of parts are consequently required to form this exquisite, almost airborne mechanism.

All the movement’s components are of course then hand finished true to the finest watchmaking tradition, including the bridges with their polished inner and outer vertical flanks, the unique “Gratté” mainplate, and the wheels with hand polished bevels top and bottom (40 sharp internal angles for a five-spoke wheel).

The open dial stands out with its hand-enamelled chapter rings, paired with elegant, finely shaped flame-blued steel hands. Naturally, the 18k white gold case is also, handmade, thanks to a pantograph mechanical lathe fitted with turning tools, before being patiently satin-finished on the sides and polished on the upper surfaces.

Created as just two or three timepieces per year, the Greubel Forsey Hand Made 1 is destined to become a new watchmaking landmark that unites both past and future. This new step towards the summit in the finest of craftsmanship is substantiated on the dial at 6 o’clock, where the inscription HAND MADE replaces the usual SWISS MADE.

Greubel Forsey Double Tourbillon 30° Technique in Ceramic

The Double Tourbillon 30°, the first Fundamental Invention by Greubel Forsey, was presented in a timepiece at Baselworld in 2004. This proved a success for the independent Atelier, and seven years later, the Double Tourbillon 30° Technique won first prize at the Concours International de Chronométrie. The timepiece achieved a record score of 915 points out of 1000 with an average timing rate of between 0.3 and 0.8 seconds per day across the whole competition.

Now Greubel Forsey is presenting the Double Tourbillon 30° Technique in ceramic, an extraordinarily accurate timepiece that is both refined and robust.

The Double Tourbillon 30° at the heart of the timepiece contributes to its exceptional accuracy. Inside a cage which rotates in four minutes, a smaller cage containing the balance and spring assembly is inclined at an angle of 30° relative to the first cage and completes a revolution in 60 seconds. The combination of the 30° inclination with the different rotational speeds of the two tourbillons improves timekeeping by averaging out positional errors due to gravity in all usual wristwatch positions and especially in stable positions.

In the Double Tourbillon 30° Technique, four coaxial barrels coupled to a spherical power-reserve differential, provide a chronometric power reserve of 120 hours.

Inspired by the phenomena of transparency and light, Robert Greubel and Stephen Forsey are pushing back the boundaries of horological architecture to draw the beholder deep inside an emblematic Greubel Forsey timepiece. For the first time encased in ceramic – a highly rigid material – this limited edition of 11 timepieces is made available to the US market.

The shades of the impressively finished and detailed blue ceramic case play with the light flooding through into the sapphire crystal movement. The timepiece has been reconstructed to incorporate these elements, requiring a very particular expertise and know-how. It now reveals the captivating spectacle of the two completely suspended cages of the Double Tourbillon 30° mechanism.

Transparency has always been an integral part of Greubel Forsey creations, and this proves particularly evident in the construction of the various editions of the Double Tourbillon 30° Technique – all presenting a panoptic view of the movement’s architecture. This Double Tourbillon 30° Technique in ceramic pushes back the boundaries of transparency even further by revisiting the construction of the entire timepiece to work with the specific constraints of sapphire crystal.

The eye can distinguish each element in marvellous detail. The small seconds and power reserve indicators in gold are finished in blue to present a contrasting effect against the frosted main plates and recall the glistening blue ceramic.

The hour and minute ring, as well as the 4-minute tourbillon-rotation indicator at 6 o’clock are both Immersive architecture made from sapphire to let the light into all levels of the mechanism. The hands are open-worked to further enhance the sense of light and transparency. Seemingly suspended in mid-air in a mystical dance, the Double Tourbillon 30° immediately attracts the attention of the viewer.

Having reconstructed the movement, Robert Greubel and Stephen Forsey embraced the challenge of accommodating sapphire crystal elements, particularly complex to machine in three dimensions and to finish to achieve the unique geometry and exacting standards of a Greubel Forsey timepiece.

The two creator watchmakers took the movement to the architectural extreme, creating three-dimensional sapphire bridges that proved particularly challenging to realise. Machined from single blocks of sapphire, their flanks are polished using different grains, requiring highly specialised tools, exceptional precision and expertise. The bevelled angles reveal a matt finish that magnificently contrasts with the polished transparent surfaces of the sapphire.

Thanks to this transparency, the entirety of the wheels and pinions comprising the timepiece are laid bare to reveal unprecedented visual access to the movement architecture.

On the dial side, the tourbillon bridge, barrel bridge, differential bridge and power-reserve bridge have been removed and recreated in sapphire to showcase the timepiece’s inner mechanism. In order to incorporate these new elements, the movement had to be rethought. Even the restrictions imposed by screws were taken into consideration in this spirit of creation: The bridges are specially mounted to absorb shocks to which the sapphire could be subjected. The plates, bridges and the mechanical architecture are therefore entirely new.

On the caseback side, the three-dimensional gear train bridge reveals an unobstructed view of the magnificently finished architecture beneath. This unusually large bridge features a multi-level design with countersinks that allow the wheels to precisely imbricate with the sapphire. The entire mechanism radiates light to reward the beholder with an enchanting spectacle. The lower tourbillon bridge – also made from sapphire – exactly reproduces the steel bridge that originally adorned the Double Tourbillon 30° Technique, marking a major feat in sapphire workmanship.

This is the first time that Greubel Forsey showcases a movement inside a ceramic case, the making of which requires great precision. The material is compacted by pressing and shaped before firing, where a thermal process shrinks it by around 25%.

Ultimately, the case measures 48.40 mm in diameter and 17.77 mm in height. Once the elements have been sintered at a very high temperature, the ceramic solidifies, making the case extremely hard and therefore more difficult to work with. The material becomes extremely resistant to scratches and corrosion, meaning the finishing requires exceptional know-how.

From polishing to linear or circular satin finishing, the finishes refine the contours of the timepiece, perfecting it in the true Greubel Forsey spirit. The deep blue ceramic gives the Double Tourbillon 30° Technique a subtle shimmer, while its physical properties make it extremely resistant. Myriad colours, finishes and textures play across the blue ceramic case and the sapphire movement.

This iconic timepiece in blue ceramic with its new architecture is being released as a unique edition of 11 timepieces exclusively available to the US market.

It is supplied with a blue rubber strap, complete with a titanium folding clasp decorated with a hand-engraved Greubel Forsey logo. The crown – also in ceramic – features a tone-on-tone engraved Greubel Forsey logo.

Technical details

Model: Double Tourbillon 30° Technique Ceramic

Movement

Hand-wound movement with synthetic sapphire bridges
Patented tourbillon
Double Tourbillon 30° • hours and minutes • small seconds • outer tourbillon 4-minutes rotation • inner tourbillon 60-seconds • power-reserve

Movement dimensions
• Diameter: 38.40 mm
• Thickness: 12.15 mm

Number of parts
• Movement: 421 parts
• Two tourbillon cages: 132 parts
• Weight of the two cages: 1.17 g

Number of jewels
• 43
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 120 hours

Barrels
• Four coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• 22k gold cover with nickel-palladium treatment and relief engraving

Balance wheel
• Variable-inertia with white gold mean-time screws (10.70 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted with polished beveling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Synthetic sapphire crystal, polished flanks
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Gold plate engraved with the individual number

Inner tourbillon
• Inclined at a 30° angle, 1 rotation per minute

Outer tourbillon
• 1 rotation in 4 minutes
• Hand-bevelled and open-worked cage pillars
• Gold counterweight

Gearing
• Involute circle profile
• Conical gearing with profiled teeth

Displays
Hours and minutes
Small seconds
120-hours power reserve on a sector
4-minutes outer tourbillon rotation
60-seconds inner tourbillon rotation

Case
Ceramic
Diameter: 48.40 mm
Height: 17.77 mm
Caseback, bezel and caseband machined from a block of ceramic, polished and straight grained, hand-finished
Three-dimensional, variable geometry-shaped lugs
Engraving “Double Tourbillon 30°” and “Greubel Forsey”
Engraved individual number
Water-resistant 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: Ceramic with engraved GF logo

Dial
Multi-level synthetic sapphire hour-ring, galvanic growth hour indexes, engraved and lacquered inner tourbillon rotation indicator
Small seconds and power-reserve indicators in gold, blue finish

Hands
Hours and minutes in polished gold, with Super-LumiNova
Small seconds, power-reserve (red triangles)
Engraved synthetic sapphire 4-minutes indicator

Strap and clasp
Rubber
Titanium folding clasp, engraved with the GF logo

Edition
Limited edition of 11 pieces

Greubel Forsey GMT Quadruple Tourbillon

Huygen’s invention of the hairspring in 1675 was a milestone in the watchmakers’ long-running quest for precision. It did not however eliminate the issue of gravity, which is detrimental to the timing of watches, particularly in vertical positions. To seek to remedy this, Abraham-Louis Breguet (1747-1823) conceived the idea of housing the regulating organ (hairspring, balance wheel and escapement) within a rotating cage. By turning around its axis, generally in one minute, the cage carried the ‘heart’ of the watch through different successive positions, thereby averaging out timing variations. The tourbillon was born (1801).

Striving to improve chronometry still further, Robert Greubel and Stephen Forsey reimagined the tourbillon principle and then developed their first three Fundamental Inventions: the Double Tourbillon 30° (2004), the Quadruple Tourbillon (2005) and the Tourbillon 24 Secondes (2006).

In their GMT Quadruple Tourbillon, the two watchmakers have chosen to revisit their second invention and to take it even further by combining it with a multiple time-zone display.

Robert Greubel and Stephen Forsey have shown creative daring and boldness in uniting their second Fundamental Invention, the Quadruple Tourbillon, with their ground breaking interpretation of the GMT with its outsized rotating globe. Displaying three time zones along with a universal time function, this exceptional timepiece is distinguished by its three-dimensional architecture created with extreme attention to fine craftsmanship.

Working on the principle that the more different positions the regulating organ moves through, the more precise the timekeeping will be, Robert Greubel and Stephen Forsey invented the Quadruple Tourbillon with a spherical differential.

Right from the original idea the concept was clear. While coupling four separate tourbillons would have been challenging, they sought a more compact solution. To save space in all three dimensions, they chose to construct the tourbillons in pairs within a unique system of compact cages, an extremely challenging feat. Each of these two systems is modelled on the Double Tourbillon 30°, with a first cage rotating in one minute and angled at 30°, fitted inside a second upright cage performing a full rotation in four minutes.

The combination of the inclination of the inner cage and the different rotational speeds of the two cages focuses on cancelling out the timing variations due to the earth’s gravitational attraction in all the usual positions a wristwatch can adopt, particularly in stable positions. The spherical differential serves to average the timing of the two autonomous oscillators and thus improve chronometric performance, a system for which two patents have been fled.

Having mastered the tourbillon, Robert Greubel and Stephen Forsey have continued to investigate and reinterpret other horological mechanisms, notably a practical and much appreciated complication: simultaneous multiple time zones display. In 2011, the two Inventor Watchmakers expressed their own vision of this modern day function in the ground breaking timepiece aptly named the GMT, more recently joined by the GMT Earth. In this patented system, the second time zone indication on a separate subdial is paired with a universal time display providing an intuitive reading of the time around the world thanks to a world first: an outsized globe completing one full rotation every 24 hours, following planet Earth itself.

In bringing the Quadruple Tourbillon and the GMT mechanisms together, Greubel Forsey not only accomplished a major technical feat that led to the creation of a new hand-wound calibre comprising 705 parts, including three fast-rotating barrels. The Inventor Watchmakers also tackled this challenge from an architectural angle to create a timepiece in which the three-dimensional approach is expressed on many levels. The main hours/minutes dial between 1 and 2 o’clock forms the highest point of the dial, where it is underlined by the subtle asymmetry of the case and complemented by a 72-hour chronometric power-reserve display. The next level is it at 4 o’clock, with the coaxial small seconds and second time zone display which is adjustable in one-hour increments by means of a pusher. Located between 8 and 9 o’clock, observers can admire the spectacular sight of the Earth in motion, surrounded by a fixed 24 hours ring around the Equator and displaying local time for all the longitudes – simultaneously taking account of the day/night indicator (on respectively light/dark zones).

A lateral window in the asymmetrical section of the case provides an unprecedented view of the Equator and the Southern hemisphere. The four tourbillons gravitate in two pairs on either side of the blue planet, each featuring an open and transparent construction, secured by flat black polished bridges and adorned with gold chatons as well as hand-polished beveling and countersinks.

Universal time is visible through the case back, with a fixed 24-hour scale bearing day/night zones and a disk with three-letter abbreviations of 24 cities representing the various time zones. This disk also distinguishes between the time zones that implement Summer Time (Daylight Saving Time) appearing in a light colour; and those that do not (shown on a dark backdrop). The case back also provides a chance to admire the Quadruple Tourbillon as well as frosted bridges with jewels set in gold chatons. The two complex asymmetrical convex sapphire crystals protecting the dial and case back also called for the utmost expertise.

This masterpiece of contemporary aesthetics comes in a unique edition of 66 pieces. The first edition of 11 of which are in white gold, numbered from 01/11 to 11/11 on a plate in the centre of the dial.

Technical details

Model: GMT Quadruple Tourbillon
Unique edition of 66 pieces
11 pieces in white gold

Movement
Hand-wound movement with 3 patents
GMT • 2nd time zone • rotating globe with universal time and day-and-night • universal time on 24 time zones • cities observing summer time • lateral window showing the equator and southern hemisphere • GMT pusher • Quadruple Tourbillon • hours and minutes • small seconds • power-reserve
Diameter: 39.50 mm
Thickness: 13.00 mm
Number of parts
• Movement: 705 parts
• Four tourbillon cages: 260 parts
• Total weight of the cages: 2.25 g
• Spherical differential: 28 parts
Number of jewels: 84; Olived-domed jewels in gold chatons
Chronometric power reserve: 72 hours
Barrels: Three series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
Balance wheel: Variable-inertia with white gold mean-time screws (10.70 mm diameter)
Frequency: 21’600 vibrations/hour
Balance spring: Phillips terminal curve; Geneva-style stud
Main plate: Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
Bridges: Nickel silver, frosted and spotted, polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment; Gold plate engraved with the individual number; Flat black polished gold plates with relief engraved text, polished bevelling and countersinks, straight-grained flanks; Four flat black polished steel tourbillon bridges, hand-polished bevelling and countersinks, straight-grained flanks

Inner tourbillons
• Inclined at a 30° angle, 1 rotation per minute
Outer tourbillons
• 1 rotation in 4 minutes
• Hand-bevelled and open-worked cage pillars
• 1 gold counterweight per double cage bearing the individual number
Gearing
• Involute circle profile
• Conical gearing with profiled teeth

Displays
Hours and minutes
Small seconds (mean performance)
72-hours power reserve on a sector
2nd time zone GMT
24 time zones universal time
Rotating titanium globe with universal time
Cities observing summer time
Day-and-night

Case
In white gold with asymmetrical convex synthetic sapphire crystal
Diameter: 46.50 mm
Height: 17.45 mm
Transparent back with asymmetrical convex synthetic sapphire crystal
Lateral window with shaped synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Raised polished engraving “GMT Quadruple” and “Greubel Forsey” on a hand-punched background
Gold security screws
Polished bezel, caseband with hand-finished straight graining
White gold GMT pusher with raised engraving on a hand punched background
Hand-engraved individual number
Water-resistance: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In white gold with engraved and black lacquered GF logo

Dial
Multi-level in gold, anthracite colour
Gold hour-ring, circular-grained with polished bevelling, black treatment
Gold hour markers
Power-reserve and GMT in gold, hand matt lapped
Small second, circular-grained

Hands
Hours and minutes in polished gold, with Super-LumiNova
Small seconds in polished steel, black treatment
Power-reserve in polished steel, hand-polished countersink
2nd time zone GMT indicator, red

Strap
Hand-sewn alligator
White gold folding clasp, hand-engraved with the GF logo

Greubel Forsey Balancier Contemporain

In creating the Balancier Contemporain, a white gold 33-piece limited edition, Greubel Forsey imagined providing a particularly compact showcase for its exclusive balance-wheel system. Creating such a moderately-sized new movement and dial imposed the challenge of maintaining well-balanced forms and pleasing proportions, along with clear legibility and cutting-edge performance. Mission accomplished with this powerfully structured timepiece featuring all the Greubel Forsey signature characteristics.

Inventor Watchmakers Robert Greubel and Stephen Forsey have made their mark on watchmaking history through a number of mechanical creations, notably the Double Tourbillon 30°, the Quadruple Tourbillon, the GMT, the QP à Équation with its Mechanical Computer, along with the Différentiel d’Égalité and the Grande Sonnerie. Artists at heart, they set the scene for these Fundamental Inventions through timepieces featuring unprecedented aesthetics, mastering asymmetry and balance to provide fresh momentum and playing with depth and volume in exploring all three dimensions. Each of these unique architectural accomplishments is crafted with extreme attention to detail with a particularly consummate skill applied to hand finishing. The result is a unique universe perfectly embodied in the new Balancier Contemporain.

This highly original creation is distinguished by its 39.6 mm diameter, a first from Greubel Forsey which generally builds larger timepieces. The challenge here was not only to house the large balance wheel within a limited space, but above all to achieve optimal proportions and an attractive three-dimensional construction, as well as safeguarding the emblematic aesthetic codes of the timepieces built within the Atelier.

Since 2004, Robert Greubel and Stephen Forsey have devoted a significant amount of time to opening up whole new horizons for the most daring mechanical complications. They have also turned their attention to the “fundamentals” of watchmaking, investigating them in a spirit of efficiency and perfection. 2017 saw the unveiling of an exclusively designed balance wheel system, entirely developed and crafted in the Greubel Forsey Atelier just outside La Chaux-de-Fonds. The innovative balance wheel is distinguished by its large 12.6 mm diameter ensuring optimal timekeeping stability. To enable fine adjustment of its moment of inertia, the balance rim is fitted with six gold mean-time screws, recessed in order to guarantee optimal aerodynamics by reducing air friction. This results in enhanced chronometric performance and facilitates adjusting by the watchmaker. This exclusive regulating organ was initially launched in a limited edition named ‘Balancier’, within Greubel Forsey’s iconic asymmetrical case in a white gold 43.5 mm diameter version measuring 13.94 mm high.

With the Balancier Contemporain, Greubel Forsey is offering an entirely new movement within the compact 39.6 mm-diameter, 12.21 mm-high case. An original and engaging display of three-dimensional architecture, this timepiece is suited to all wrists and asserts itself as a new creation in its own right. While maintaining the emblematic large balance wheel, the Inventor Watchmakers entirely rethought this new movement construction so as to trim the dimensions without compromising performance in any way. The manual-winding calibre comprises 255 components, all crafted and finished in the Greubel Forsey spirit of the finest workmanship. It is endowed with a 72-hour power reserve ensuring chronometric performance by means of two series-coupled fast-rotating barrels– one of which is equipped with a slipping spring to avoid excess tension. The movement is also equipped with a crown-activated ‘stop balance’ system enabling time-setting to the nearest second. The white gold case flows into three-dimensional lugs formed from geometry – a subtle and elegant expression of creative skill. These original volumes are accentuated by alternating finishes – polished bezel and lugs, satin-brushed caseband and caseback – creating a play on contrasts that has become a signature of Greubel Forsey timepieces.

The entirely reimagined display side plays with split levels as well as various materials and finishes. In this three-dimensional transparent architecture, drawing the gaze into a rotational movement, each of the indications is perfectly highlighted so as to ensure optimal legibility. The offset hours/minutes dial appears at 2 o’clock with its blued steel hands featuring hand-polished countersinks and flat polished centres, along with its apertures revealing the exclusive Greubel Forsey balance wheel, gear train and three-dimensional tripod bridge. At 10o’ clock, on a slightly lower level, a finely hand-frosted bridge houses the power-reserve display graced by a slender blued steel hand. Just below it, between 8 and 9 o’clock, the small seconds rotates steadily, supported by a frosted and bevelled bridge providing a glimpse of the gilded barrel drum with Greubel Forsey engraving. Proudly showcased at 6 o’clock in keeping with its stature, the exclusive balance wheel is set against the background of a bridge meticulously hand-polished by an experienced craftsman to obtain the famous mirror polish that is a supreme goal for watchmakers. The balance wheel pivots at the top in a slim, carefully bevelled and flat black-polished bridge. This perfectly balanced composition is framed by a slim white gold bezel, while a high-domed sapphire crystal ensures optimum transparency.

Despite being generally hidden from sight, the caseback side of the new Balancier Contemporain, a work of art in itself, is protected beneath a high-domed sapphire crystal and crafted with the same expertly mastered artisanal touch embodied in all Greubel Forsey timepieces. The centre is occupied by an engraved circular red gold plate bearing the GF logo and the individual limited-edition number.

It is surrounded by a white gold bridge, relief engraved with the key Greubel Forsey values and black polished. This credo is further enhanced by characteristic olive-domed jewels in gold chatons, with finely polished countersinks reflecting the deep red hue of the stones. Held by gold security screws, the caseback is signed with raised polished engraving – “Greubel Forsey” and “Balancier” – on a hand-punched background. This timepiece is fitted with a hand-sewn leather or alligator strap, secured by a white gold pin buckle hand-engraved with the Greubel Forsey logo.

Greubel Forsey pairs the launch of the Balancier Contemporain with the diamond set edition becoming a sparkling sculpture where mother-of pearl dials underline its elegance. This lustrous new creation stands out like the Balancier Contemporain for its compact size and its exclusive balance wheel system.

Diamond Set Balancier Contemporain

Its unique proportions are enhanced by the radiance of the diamonds where the bezel, case band, lugs and crown are all invisibly set with the finest IF / D-E quality baguette-cut diamonds. This diamond set edition is fitted with an alligator or rubber strap and the gold pin buckle or folding clasp with the hand engraved Greubel Forsey logo is also invisibly set with baguette diamonds.

Technical details

Balancier Contemporain, Limited edition of 33 pieces in white gold, Hand-wound movement : Timepiece with four hands • hours and minutes • small seconds • power-reserve • GREUBEL FORSEY balance wheel system • stop balance

Balancier Contemporain

Movement

Movement dimensions
• Diameter: 32.40 mm
• Thickness: 9.20 mm

Number of parts
• Movement: 255 parts

Number of jewels
• 33
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Barrel with relief engraving “Greubel Forsey”

Balance wheel
• In-house variable-inertia with 6 gold mean-time screws (12.60 mm diameter)
• Stop balance activated by crown

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Titanium, frosted and spotted, straight-grained flanks

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Power-reserve bridge with galvanic growth
• Flat black polished steel balance wheel bridge, hand-polished bevelling and countersinks, straight-grained flanks
• Flat black polished gold plate under the balance wheel, polished bevelling and countersinks, straight-grained flanks
• Flat black polished gold plate on the movement side with relief engraved text, polished beveling and countersinks, straight grained flanks with apparent gold chatons
• Central gold plate, “GF” engraved with the individual number

Gearing
• Involute circle profile

Displays
• Hours and minutes
• Small seconds
• 72-hours power reserve on a sector

Exterior

Case
• In white gold with high domed synthetic sapphire crystal
• Transparent back with high domed synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped lugs
• Raised polished engraving “Balancier” and “Greubel Forsey” on a hand-punched background
• Gold security screws
• Hand-polished bezel, caseband with hand-finished straight graining
• Hand-engraved individual number

Case dimensions
• Diameter: 39.60 mm
• Height: 12.21 mm

Water resistance of the case
• Water-resistant 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
• In white gold with engraved and black lacquered GF logo

Dial
• Multi-level in gold, rhodium-coloured, black lacquered hour-ring and minute-circle, with a visual opening for the balance wheel, polished bevel
• Small seconds in gold, rhodium-coloured, polished bevel
• Power-reserve in gold, engraved and black lacquered, hand matt lapped

Hands
• Hours and minutes, small seconds and power-reserve in polished blued steel, hand-polished countersinks

Strap and clasp
• Hand-sewn alligator
• White gold pin buckle, hand-engraved with the GF logo

Diamond Set Balancier Contemporain, In white gold or in 5N red gold with IF / D-E quality baguette-cut diamonds, Hand-wound movement: Timepiece with four hands • hours and minutes • small seconds • power-reserve • GREUBEL FORSEY balance wheel system • stop balance

Diamond Set Balancier Contemporain

Movement

Movement dimensions
• Diameter: 32.40 mm
• Thickness: 9.20 mm

Number of parts
• Movement: 255 parts

Number of jewels
• 33
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Barrel with relief engraving “Greubel Forsey”

Balance wheel
• In-house variable-inertia with 6 gold mean-time screws (12.60 mm diameter)
• Stop balance activated by crown

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted, straight-grained flanks, nickel-palladium treatment
Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Flat black polished steel balance wheel bridge, hand-polished bevelling and countersinks, straight-grained flanks
• Flat black polished gold plate on the movement side with relief engraved text, polished beveling and countersinks, straight-grained flanks with apparent gold chatons
• Central gold plate, “GF” engraved with the individual number

Gearing
• Involute circle profile

Displays
• Hours and minutes
• Small seconds
• 72-hours power reserve on a sector

Exterior

Case
• In white gold or in 18k 5N red gold with high domed synthetic sapphire crystal
• Bezel and caseband, invisibly set with baguette-cut diamonds
• Three-dimensional, variable geometry-shaped lugs, invisibly set with baguette-cut diamonds
• Transparent back with high domed synthetic sapphire crystal
• Raised polished engraving “Balancier” and “Greubel Forsey” on a hand-punched background
• Gold security screws
• Hand-engraved individual number

Case dimensions
• Diameter: 41.60 mm
• Height: 12.25 mm

Water resistance of the case
• Water-resistant 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
• In white gold or in 18k 5N red gold with engraved and black lacquered GF logo, invisibly set with baguette-cut diamonds

Dial
• Multi-level in gold and mother-of-pearl with a visual opening for the balance wheel, polished bevel
• Small seconds in gold and mother-of-pearl, polished bevel
• Power-reserve in gold, engraved and black lacquered, hand matt lapped

Hands
• Hours, minutes, small seconds and power-reserve in polished gold, hand-polished countersinks

Strap and clasp
• Alligator or rubber
• White gold or 18k 5N red pin buckle, hand-engraved with the GF logo

IF / D-E quality diamonds and carats
• 232 baguette-cut diamonds / 9.58 ct total
• Caseband and lugs : 160 baguette-cut diamonds / 6.21 ct
• Bezel: 60 baguette-cut diamonds / 3.06 ct
• Crown: 12 baguette-cut diamonds / 0.31 ct

Greubel Forsey Art Piece Edition Historique

At SIHH 2019, Greubel Forsey presented their latest creation, the Art Piece Edition Historique. Looking into the wide open heart at its three-dimensional construction and highly original geometry, the new Art Piece Edition Historique crowns the avant-garde aesthetic approach behind numerous exceptional creations. Combining technicity, exclusivity and the finest craftsmanship, this 33-piece limited edition (of which the first 11 are in platinum) presents a new vision of time in the spirit of the revived and renewed notion of Fine Watchmaking by Greubel Forsey.

Art Piece Edition Historique

The Greubel Forsey manufacture was established in 2004. Their focus on art and invention is both technical – with innovative mechanisms found in creations such as the Double Tourbillon 30°, the Quadruple Tourbillon, the GMT and the Grande Sonnerie – and architectural in terms of the highly original aesthetic approach that Robert Greubel and Stephen Forsey pursue in their creative process. This major artistic and architectural adventure took off in 2006, when the two Inventor Watchmakers created the Opus 6 for Harry Winston. At a time when open dials were virtually unheard of, Greubel Forsey were pioneers of this revolution by showcasing their Double Tourbillon 30° (teamed with disc displays for the hours, minutes and power reserve) within a masterful multi-level three-dimensional movement.

This highly acclaimed model, although only a six-piece limited edition, was certainly not an isolated achievement. It marked the start of a ground-breaking journey, a true creative exercise whose development we can follow over the years, like observing the evolution of a painter, sculptor or architect. Rather than reworking an existing calibre in order to create a visual impact (as is generally the case with a skeletonised movement), Robert Greubel and Stephen Forsey opted right from the outset to approach the entire conception of the movement in architectural terms.

The period between 2007 and 2011 thus saw the emergence of the first three Invention Pieces, each paying tribute to one of Greubel Forsey’s Fundamental Inventions in the realm of tourbillons. Multilevel constructions, offset subdials, hand or disc displays, concentric hours/minutes indications, interplays of transparency and depth, contrasting materials and colours, lateral case windows, asymmetrical domed sapphire crystals: these three masterpieces defined the essence of a new aesthetic vocabulary, amplified by an extreme concern for fine craftsmanship as much for the movement as the exterior elements.

The birth of the astonishing Art Pieces heralded the next stage in the approach to a timepiece as a means of artistic expression. Art Piece 1 (2013), co-created with British artist Willard Wigan, was distinguished by a micro-sculpture housed inside the case, complete with a miniature high-power optical system ensuring surprising views of the artwork, otherwise barely visible to the naked eye. Art Piece 2 – Edition 1 (2016) paid a stunning tribute to watchmaking art supplanting the micro-sculpture with a micro-engraved sketch of the Double Tourbillon 30° which animates this timepiece. It was followed by the Art Piece 2 – Edition 2 (2017) which further pushed creative limits by combining the Double Tourbillon 30° with an on-demand display of the hours and minutes along with an oversized power reserve indication. The latter is in fact the only sign of time passing by when the hours and minutes aperture is closed.

Greubel Forsey now pays tribute to this artistic and architectural approach with a creation that sums up and magnifies its true spirit. Following on from previous Art Pieces, the Art Piece Edition Historique houses within its 44 mm-diameter case a new movement with a variation on the theme of the Double Tourbillon 30°: a mechanism designed to enable the balance wheel to oscillate consistently in all planes ensuring maximum precision. The new 475-part hand-wound movement boasts a 72-hour power reserve with optimal chronometric performance, ensured by two series-coupled fast rotating barrels.

Art Piece Edition Historique

The most eye-catching aspect of all is the multilevel construction that opens up whole new vistas.The gaze is first drawn to the Double Tourbillon 30° majestically set against a royal blue background, with the flat black polished bridge and hand-bevelled and open-worked cage pillars. It is a veritable sculpture in motion, with its inner tourbillon inclined at a 30° angle performing one rotation per minute and its outer tourbillon completing a revolution in four minutes. The small seconds dial is positioned on the same level, between 10 and 11 o’clock. Lifted onto a significantly higher plane, the power-reserve indication bears large Arabic numerals and a blued steel hand. Higher still, at 2 o’clock, the offset hours/minutes subdial has been replaced with a daring titanium dome featuring a hand-punched background entirely engraved with the finely polished Greubel Forsey key values.

The hours are discreetly displayed by a red hand on a separate rotating ring, while the minutes appear on request through an aperture thanks to a simple press on the crown-fitted pusher. By giving pride of place to the tourbillon and power reserve in relation to the hours/minutes indication, the Art Piece Edition Historique asserts itself as a ‘philosophical timepiece’. It draws the collector to experience a new relationship with temporality, based on a deeper consideration of the time passing and the time that remains. The caseback also offers a most original design, a rear view of the Double Tourbillon 30° surrounded by the barrel bridge where one can admire the jewels in gold chatons and the hand-polished countersinks, completed by the relief-engraved signatures of Robert Greubel and Stephen Forsey.

Art Piece Edition Historique

Within the strictly limited 33-piece edition, the first 11 Art Piece Edition Historique timepieces are to be made in platinum and the 22 subsequent ones in different materials. Enhancing the sense of continuity with the other Art Pieces, Greubel Forsey has chosen to encompass the 18 previous examples within the total to date. The 11 platinum Art Piece Edition Historique models will thus be numbered from 19/51 to 29/51 – figures appearing both on the caseback and on the small plate alongside the Double Tourbillon 30°.

Technical details

Art Piece Edition Historique
Unique edition of 33 pieces
11 pieces in platinum
Hand-wound movement with patented tourbillon
Timepiece testifying to the artistic expression of Greubel Forsey • Double Tourbillon 30° • hours • minutes on demand • small seconds • power-reserve

Movement

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 12.37 mm

Number of parts
• Complete movement: 475 parts
• Two tourbillon cages: 130 parts
• Total weight of the two cages: 1.12 g

Number of jewels
• 50
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with white gold mean-time screws (10.70 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plate
• Titanium, frosted and spotted, with polished bevelling, blue finish

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Titanium plates with polished relief-engraved text, polished bevelling and countersinks
• Founders’ signature in relief by galvanic growth
• Flat black polished steel tourbillon bridges, hand-polished bevelling and countersinks, straight-grained flanks

Inner tourbillon
• Inclined at a 30° angle, 1 rotation per minute

Outer tourbillon
• 1 rotation in 4 minutes
• Hand-bevelled and openworked cage pillars
• Gold counterweight

Gearing
• Involute circle profile
• Conical gearing with profiled teeth

Displays
• Hours
• Minutes on demand on disc
• Small seconds
• 72 hours sectorial power reserve

Exterior

Case
• In platinum 950 with high domed synthetic sapphire crystal
• Transparent back with synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped lugs
• Raised polished engraving “Edition Historique” and
“Greubel Forsey” on a hand-punched background
• Gold security screws
• Polished bezel, caseband with hand-finished straight graining
• Platinum 950 plates, engraved, hand-finished with texts, screwed to the caseband
• Hand-engraved individual number

Case dimensions
• Diameter: 44.00 mm
• Height: 15.95 mm

Water resistance of the case
• Water-resistant 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown with pusher
• In platinum 950 with engraved and black lacquered GF logo
• Crown pusher for the minutes display

Dial
• Multi-level in titanium, dome-shaped
• Hour-ring with lacquered indexes, relief-engraved texts
• Metallised synthetic sapphire shutter, hiding or revealing the minutes display
• Small seconds indicator in gold, engraved and lacquered, hand matt lapped
• Power-reserve indicator in titanium with relief-engraved scale

Hands
• Hours (red triangle)
• Small seconds in polished blued steel, hand-polished countersink
• Power-reserve in polished blued steel

Strap and clasp
• Hand-sewn alligator
• Platinum 950 folding clasp, hand-engraved with the GF logo

Greubel Forsey Grande Sonnerie Wins the “Mechanical Exception” Award at the GPHG 2018

The Grande Sonnerie, the most complex Greubel Forsey creation to date, has been awarded the “Mechanical Exception” prize at the Grand Prixd’Horlogerie de Genève 2018 event.

Conducting 11 years of research, assembling no less than 935 parts, filing two patents, incorporating Greubel Forsey’s third Fundamental Invention (Tourbillon24 Secondes), developing an acoustic resonance cage generating an extreme purity of sound, installing eleven functional safety features ensuring unparalleled intuitive ease of use, performing a three-year wearing test.

As highlighted by this only partial list of the stages involved, the creation of the Grande Sonnerie was indeed a monumental undertaking by Robert Greubel, Stephen Forsey and their team. This timepiece embodies the quintessence of their expertise and their ideal of horological excellence.
The Grande Sonnerie is undoubtedly one of the greatest horological complications. Right from the beginning of their partnership, Robert Greubel and Stephen Forsey began reflecting on what their own resolutely contemporary vision of this regal complication might be. For eleven years, the Grande Sonnerie set the cadence of their day-to-day lives, as they worked in the utmost secrecy to assemble the 935 components of this timepiece, and above all to ensure absolute harmony between the movement, the exterior and the acoustics.

Its ergonomics guarantee unparalleled intuitive ease of use. To ensure optimal architectural balance, obsessive attention to detail was devoted to the intelligent integration of the most important mechanisms and indications (tourbillon, cathedral gongs, striking hammers, power-reserve display…). The creators thus succeeded in completing the Grande Sonnerie within a titanium case measuring 43.5 mm in diameter and a height of just 16.13 mm– an entirely reasonable size given the complexity of the timepiece.

The acoustics of this Grande Sonnerie are all the more impressive given that the timepiece is water resistant to 3 Atm (approx. 30 metres), an outstanding accomplishment serving to ensure that the sound emits a clear, strong strike. Much like a stringed instrument, the titanium acoustic resonance cage was developed inside the case-band itself, so as to provide the loudest possible volume. The extremely pure crystalline strike is transmitted thanks to one-piece double cathedral gongs – on three levels and respectively sounding high and low notes – that are visible through the tourbillon’s lateral window.

The two striking hammers are notably visible on the dial side, featuring flat black-polishing, hand bevelling and polished countersinks. The gold bridge supporting them is relief-engraved and has the same exceptional finishes, as well as straight-grained flanks. While the movement is manual-winding, the striking mechanism also features an automatic winding system by means of a platinum oscillating weight engraved with the Greubel Forsey guiding spirit – and delivering some 20 hours’ strike reserve in Grande Sonnerie mode.

The Grande Sonnerie strikes the hours and quarters in passing, while the Petite Sonnerie sounds only the full hours in passing. A Silence mode can be activated via a pusher. On demand, a minute repeater and its additional mechanism strike the time to the exact quarter and minute. This timepiece also includes another feat thanks to a silent speed regulating governor, using an inertia flywheel specially designed to muffle the whirring sound habitually made by traditional strike speed regulation mechanisms.

The timekeeping precision of the timepiece is ensured by the third Fundamental Invention: the Tourbillon 24 Secondes, which uses fast rotational speed and an inclined angle to solve the problem of the oscillator’s critical positions in relation to gravity. The 25° angle and the rapid revolution of the tourbillon cage significantly improves the precision timekeeping performance of a system comprising just one tourbillon, especially in static positions. Among the other salient characteristics of this timepiece are a frequency of 21,600 vibrations/hour and a chronometer-worthy power reserve of 82 hours.

GREUBEL FORSEY Double Tourbillon Technique Blue Limited Edition

This new edition of GREUBEL FORSEY Double Tourbillon Technique timepiece boasts a blue dial lay out. This new version is available in limited edition of 33 pieces in titanium, platinum or white gold.

Double Tourbillon Technique Blue

Equipped with a hand-wound movement with patented tourbillon, this timepiece incorporates an inner tourbillon inclined at a 30° angle and revolving 1 rotation per minute and an outer tourbillon that revolves 1 rotation in 4 minutes.

Double Tourbillon 30° Technique Blue

The combination of the 30° inclination with the different rotational speeds of the two tourbillion cages improves timekeeping by averaging out positional errors due to gravity in all usual wristwatch positions, and especially in static positions.

Double Tourbillon Technique Blue

In its dial side, the watch features a blue coloured multi-level synthetic sapphire hour ring with hour indexes and golden hour and minute hands with Super-LumiNova. In addition to the dazzling display of the two tourbillons, the dial also hosts a small seconds counter and a power reserve indicator.

Double Tourbillon 30° Technique Blue

Technical details

Model: Double Tourbillon Technique Blue
Limited edition of 33 pieces in titanium, platinum or white gold

Movement

Hand-wound movement with patented tourbillon
Double Tourbillon 30° • hours and minutes • small seconds • outer tourbillon 4-minutes rotation • inner tourbillon 60-seconds • power-reserve

Movement dimensions
• Diameter: 38.40 mm
• Thickness: 12.15 mm

Number of parts
• Movement: 396 parts
• Two tourbillon cages: 132 parts
• Weight of the two cages: 1.17 g

Number of jewels
• 43
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 120 hours

Barrels
• Four coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Black finished 22k gold cover with relief engraving

Balance wheel
• Variable-inertia with white gold mean-time screws (10.70 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted with polished bevelling and countersinks, straight-grained flanks, blue finish

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, blue finish
• Gold plate engraved with the individual number

Inner tourbillon
• Inclined at a 30° angle, 1 rotation per minute

Outer tourbillon
• 1 rotation in 4 minutes
• Hand-bevelled and open-worked cage pillars
• Gold counterweight

Gearing
• Involute circle profile
• Conical gearing with profiled teeth

Displays
• Hours and minutes
• Small seconds
• 120-hours power reserve on a sector
• 4-minutes outer tourbillon rotation
• 60-seconds inner tourbillon rotation

Exterior

Case
In titanium with convex synthetic sapphire crystal
Diameter: 47.50 mm
Thickness: 16.84 mm
Transparent back with synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs, screwed fixing
Raised polished engraving “Double Tourbillon 30°” and “Greubel Forsey” on a hand-punched background
Gold security screws
Polished bezel, caseband with hand-finished straight graining
Two titanium plates, engraved, hand-finished with texts, screwed to the caseband
Engraved individual number
Water resistance of the case: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In titanium with engraved GF logo

Dial side
Multi-level synthetic sapphire hour-ring, galvanic growth hour indexes, engraved and lacquered inner tourbillon rotation indicator
Small seconds and power-reserve indicators in gold

Hands
Hours and minutes in polished gold, with Super-LumiNova
Small seconds, power-reserve (red triangles)
Engraved synthetic sapphire 4-minutes indicator

Strap and clasp
Black rubber or hand-sewn alligator
Titanium folding clasp, engraved with the GF logo

GREUBEL FORSEY

Greubel Forsey is a Swiss watchmaking company specialized in very high-end complicated timepieces. The brand was launched in 2004 by Robert Greubel and Stephen Forsey and is based in La Chaux-de-Fonds, Switzerland.

Robert and Stephen play perfectly complementary roles. Robert is more concerned with the issues of design and creation, while Stephen excels in the more technical areas. But one thing is certain – they share a similar vision of contemporary fine watchmaking. For both men, each creation writes a new chapter in the story of watchmaking. They set out to invent original mechanisms to improve performance, such as the inclined tourbillon, the inclined double balance wheels or mechanical computer – and together to design the original architecture to house these mechanisms. This spirit of research goes hand-in-hand with the extreme care devoted to putting the finishing touch to each individual component of their Timepieces. Robert and Stephen set themselves no limits. Each technical impossibility leads to a new challenge. Each problem demands a solution.

For Robert and Stephen, the making of Timepieces today goes far beyond merely making watches. Their research has led them towards contemporary art and many of their working methods mirror those of artists. This has given rise to the Art Piece series, designed in tandem with a number of visual artists. However, their experimental activities – devoted to the future of fine watchmaking – are also balanced by a journey into the past. The aim of the programme known as Le Garde Temps – Naissance d’une Montre is to keep a number of traditional skills under threat from changes and progress in the watchmaking industry alive. The work of Robert Greubel and Stephen Forsey encompasses all this, and much more besides.

Born in Alsace, France, and Robert Greubel discovered his vocation for precision mechanics at a very tender age. As a child, he would spend long hours with his father, a watchmaker and later went on to join the family business “Greubel Horlogerie”. Passionate about complication movements, in 1987 he moved to Schaffhausen in Switzerland, where he joined IWC to work on their Grand Complication project. He moved to Le Locle in 1990 for a prototypist’s position at Renaud & Papi, where he rose up the ranks to Co-Chief Operating Officer and partner. In 1999, Robert Greubel left to work independently and in 2001 he founded CompliTime in partnership with Stephen Forsey, with the aim of creating and developing complication mechanisms for the key brands. They co-founded Greubel Forsey in 2004.

Stephen Forsey was born in St. Albans, England, where he inherited his father’s fascination with the intricacies of mechanics. From 1987, he specialised in antique watch restoration, and he subsequently became the head of Asprey of London’s prestigious watch restoration department; he then furthered his horological education at WOSTEP (Watchmakers of Switzerland Training and Educational Program). After moving to Switzerland in 1992, Stephen joined Robert Greubel’s team at Renaud & Papi where he worked on the most complicated mechanical movements. In 1999, he left to work independently and in 2001 he co-founded CompliTime with Robert Greubel. Together, they then launched Greubel Forsey in 2004.

When Robert Greubel and Stephen Forsey teamed up and launched Greubel Forsey in 2004, they already shared the same philosophy and a certain number of principles.

Convinced that room still existed for creativity in the development of complications in watchmaking, they refused to accept a widespread reliance on 18th century mechanisms to curb their creativity. Their goal was to improve the performance of existing complications but also to invent innovative mechanisms. This spirit of research driven by insatiable curiosity has also allowed them to explore new areas of artistic expression. Over the years, they have honed their creative approach to fine watchmaking, notably with their Invention Pieces and Art Pieces – Timepieces created in collaboration with a contemporary artist. The technical and aesthetic aspects complement each another, giving rise to bold creations.

The quality and originality of Greubel Forsey’s work has rapidly become well known. Their regular output of fine Timepieces has been honoured with many prizes, (notably the Prix Gaïa in 2009 and the Prix du Concours International de Chronométrie in 2011). Furthermore, the Greubel Forsey Atelier now participates in the Salon International de la Haute Horlogerie (SIHH) in Geneva, which brings together some of the most prestigious watchmaking brands.

During their first decade, barely nine-hundred Timepieces in total have been completed in the Greubel Forsey workshops – on average, not more than one hundred each year. This speaks volumes about the quality of their workmanship and attention to detail. The story is told in the «Grand Livre», in which the details of each exceptional creation are painstakingly inscribed by hand.

The Grand Livre
In former times, watchmaking establishments would carefully make a handwritten entry each day in a ledger, the “Grand Livre” recording each and every watch produced in their workshops. This Great Book therefore represented the company’s ultimate archive, a permanent record which would outlive the men who produced it.

In an era of the Internet and digitalisation, Robert Greubel and Stephen Forsey chose to continue the secular tradition of keeping a ledger -the “Grand Livre”- to record this deeply human dimension of their fine watchmaking. Each handwritten entry is synonymous to a birth certificate for the Timepiece, as well as the basis for a record of its future. An important milestone in this journey is the collaboration with Christie’s auction house. This ensures that collectors will be able to acquire a Timepiece which is fully compliant with Greubel Forsey’s exacting criteria concerning quality and craftsmanship.

Importantly, the original built of each Greubel Forsey Timepiece offered for sale by Christie’s is authenticated. Throughout the year and across the world, Greubel Forsey and Christie’s join forces to help collectors obtain expert advice as well as an assessment of their Timepiece. This innovative approach is a part of Greubel Forsey’s way of accompanying its enthusiasts to maintain and preserve their collection.

Inventions by Greubel Forsey
In 2014, Greubel Forsey celebrated their 10th anniversary. Since the establishment of Greubel Forsey luxury watch atelier in 2004, Robert Greubel and Stephen Forsey have created seven inventions. They have also registered around fifty patents. Having explored and mastered tourbillons – notably the Double Tourbillon 30°, the Quadruple Tourbillon and the Tourbillon 24 Secondes; they then went on to develop the Double Balancier and the Computeur Mécanique (QP à Équation). These inventions are the beating heart of their numerous Timepieces. The Master Watchmakers love nothing more than exploring different architectural interpretations – as with their Invention Pieces – even if this means that the time display takes second place.

1. Double Tourbillon 30°
Greubel Forsey’s first invention, the Double Tourbillon 30°, features an innovative double tourbillon mechanism with one tourbillon – inclined at 30° and rotating in 60 seconds – inside another rotating in four minutes. The combination of the 30° inclination with the different rotational speeds of the two tourbillons improves timekeeping by averaging out positional errors due to gravity, especially in stable positions.

2. Quadruple Tourbillon
In the second invention, each of the four tourbillons connected to a spherical differential contributes independently to obtain a precise and reliable timing rate, especially in stable positions. Indeed, the Quadruple Tourbillon principle relies on the use of four separate cages grouped in pairs and connected to a spherical differential. The latter transmits the average timing rate of four tourbillons and thus improves the chronometric performance of the ensemble of regulating organs.

3. Tourbillon 24 Secondes
The third invention, the Tourbillon 24 Secondes, is based on a fast rotation speed to solve the problem of critical positions of the oscillator in relation to gravity. The 25° angle and the rapidly changing position of the tourbillon significantly improves the chronometric performance of a system using only one tourbillon, especially in stable positions.

4. Balancier Spiral Binôme
It was necessary to develop an inclined gearing profile and an ultra-light tourbillon cage to resolve the considerable mechanical constraints imposed by this system. In order to improve the interaction between the balance and balance spring, Greubel Forsey has explored the solution of using the same material for both elements. This patented invention is based on the use of a nonmagnetic material that is not affected by variations in temperature, lending these properties to both the balance and balance spring. A working prototype with synthetic diamond validated the approach, paving the way for research on other materials.

5. Différentiel d’Egalité
The fifth invention of Greubel Forsey transmits constant energy from the mainspring barrel to the regulator. The Différentiel d’Egalité is based on a spherical differential that receives energy from the mainspring barrel and releases it in constant amounts to the regulating organ. To achieve this constant flow of energy, the mainspring barrel feeds a secondary spring that is rewound every five seconds. Placed just before the regulating organ, the spring ensures a uniform transmission of energy and eliminates torque variations due to the constantly changing state-of-wind of the mainspring, correcting any variations in torque generated by the gear train.

6. Double Balancier
For their sixth invention, Greubel Forsey has explored a novel approach in order to obtain the average timing rate in a stable position. In the Double Balancier, two oscillators are arranged along two different axes at precise predetermined angles. Thanks to the combined effects of the spherical differential and the angle of the balances, this system helps to minimise the effects of gravity and maximise timing precision.

7. The Mechanical Computer for the QP à Équation
Greubel Forsey’s seventh invention is a mechanical computer developed for their Equation of Time Perpetual Calendar wristwatch. This mechanical computer has redefined certain functions of historic astronomical clocks. From the start, it was specifically developed for the Quantième Perpétuel à Équation to manage date displays and the equation of time. It comprises a set of coded wheels mounted coaxially with movable programmed sections. Depending on their rotation speeds and number of teeth, these wheels provide a variety of information (months with 30/31 days and leap years [February 28/29 days]).The mechanical computer enables rapid and simple correction of the indications via the winding crown without any traditional calendar correctors. It directly drives a system of sapphire disks, which displays the equation of time, i.e. the difference between the «real» solar time and civil time. It can be adjusted in both directions without risk of damage. It is very easy to go back or forward in time to know the day corresponding to a specific date. This new invention is composed of 25 parts and is the subject of three new patents.

Greubel Forsey Work Shop
Located in La Chaux-de-Fonds in the heart of the Swiss Jura Mountains, Greubel Forsey workshop perfectly reflects the brand’s dual commitment to both heritage and ground-breaking innovation. Firstly, there is the Farmhouse, a splendid 17th-century rural building, which has been painstakingly restored.

Robert Greubel and Stephen Forsey have retained the spirit of the building with the vaulted cellar, the beams and even the sundial – a rare example of gnonomic art in the region. The understated combination of stone and wood creates a warm atmosphere in which to welcome visitors, live and exchange ideas. Directly linked to the Farmhouse, surges the contemporary building, which houses the Atelier and was designed by architect Pierre Studer. This building combines wood, metal, concrete and glass. Its sloping green roof creates the illusion that it could have risen from the ground through tectonic forces, yet simultaneously blending naturally into the landscape. From a technical standpoint, its double-skin glass façade acts as a natural thermal buffer zone. The building benefits from natural air conditioning, ensuring a constant temperature all year round.

In Greubel Forsey workshops, one can see a wide range of professionals working together at the various stages that go into the creation of extra-ordinary mechanical Timepieces. Each year, the brand highlights one of these highly specialised professions from the Creative Watchmaker to the Laboratory Technician, not forgetting the Prototypist, the Machinist, the Designer or the Movement Finisher. Each of these professionals contributes his or her expertise at a precise moment whether it concerns the architecture, decoration, approval or final assembly of a Timepiece.

Behind every great Timepiece is a Creative Watchmaker. He plays a role which can be compared to that of an Artistic Director in a top fashion house. From the very outset, he is actively involved in the creative design process starting with sketching out the project, both literally and figuratively.

The Creative Watchmaker is gifted with a creative talent. He must never let material constraints curb his creative extravagance. Therefore, he is not closely involved with day-to-day business matters, which mainly fall upon the CEO. The expert technical and historical knowledge of the Creative Watchmaker are tools that help shape his creative concepts. He is able to take inspiration from various sources, such as architecture, fine arts, design and nature itself. Urging his colleagues to push the technical boundaries of watchmaking, the Creative Watchmaker motivates and guides each team to ensure the final creation reflects the initial concept. He focuses on transmitting and sustaining an overall vision, (which involves technical, aesthetic and philosophical aspects) in order to ensure the future of the adventure.

At Greubel Forsey, Robert Greubel is the Creative Watchmaker. The initial creative impulses that he fine-tunes on a daily basis with his colleagues do not intially take into account feasibility studies or obey any marketing rules. This energy motivates each colleague to create tools and to come up with the solutions that make the project possible.

Prizes and Awards
Since its foundation in 2004, Greubel Forsey has won three most prestigious awards – The Gaïa Prize, The Aiguille D’or and the International Chronometry Competition – in the watchmaking industry. In 2009, the company won the Gaïa Prize for Robert Greubel and Stephen Forsey’s ‘entrepreneurship’. This distinguished award conferred by the Musée International d’Horlogerie in La Chaux-de-Fonds is commonly regarded as watchmaking’s equivalent of the Nobel Prize. In 2010, the Double Tourbillon 30° “Édition Historique” was awarded the Aiguille d’Or in the Grand Prix d’Horlogerie de Genève and was named Watch of the Year across all categories. Thirdly, in 2011, the brand’s first invention, the Double Tourbillon 30° Technique won 1st prize in the International Chronometry Competition in Le Locle, introduced by the Le Locle Watch Museum, in partnership with the COSC (the Swiss Official Chronometer Testing Institute), the Besançon Observatory and the Haute Ecole Arc Ingénierie school of advanced engineering in Le Locle.

Greubel Forsey’s timepieces have often had the honour of receiving recognition from the public as well as the specialist press. In 2007, Invention Piece 1 won the prize for ‘Grand Complication Watch’ awarded by the international magazine Revolution. That same year, the Swiss magazine Montres Passion awarded the ‘Special Jury Prize – Watch of the Year’ to the Tourbillon 24 Secondes. In 2008, Revolution magazine awarded the Quadruple Tourbillon the prize for ‘Best Technical Achievement’. In 2009, this same Quadruple Tourbillon received the prize for best ‘Grand Complication Watch’ presented by the Grand Prix d’Horlogerie Asia. The Double Tourbillon 30° Technique was also awarded the ‘Grand Complication Watch’ prize at the Grand Prix d’Horlogerie de Genève.

In 2011, Invention Piece 2 was honoured with the ‘Limited Edition Watch of the Year’ prize at the Watch World Awards in India. In the same ceremony, Greubel Forsey was also awarded a prize for its ‘contribution to Haute Horlogerie’. In 2012, Invention Piece 2 received two prizes in succession: it ranked first in the ‘Best Design Watch’ category at the Middle East Premier Awards, then won the ‘Grand Complication Watch’ prize at the Grand Prix d’Horlogerie de Genève. For its part, the GMT watch was also awarded the ‘Best Complication Watch’ prize at the Watch World Awards in India. On 27th November 2014, the “Middle East watch of the year awards” granted Greubel Forsey QP à Equation, with the Best Technical Innovation Watch award 2014.

Major Projects
Greubel Forsey doesn’t just create watches. The luxury watch manufacture also spend some of its time and energy on long term projects. The main two projects undertaken by Greubel Forsey are Le Garde Temps-Naissance d’une Montre and the Time Art Gallery.

Le Garde Temps – Naissance d’une Montre
Launched in 2011, the ‘Garde Temps – Naissance d’une Montre’ project is a fundamental part of Greubel Forsey. Due to the widespread use of industrial methods, traditional craftsmanship and expertise could disappear forever from watchmaking workshops. In collaboration with master watchmaker Philippe Dufour, Greubel Forsey has decided to collect and compile traditional watchmaking techniques in order that they can be passed on to future generations. This desire to stem the disappearance of skills is demonstrated in «Le Garde Temps – Naissance d’une Montre», a unique project that will result in the creation of a wristwatch, from the drawing board to the finished timepiece. To carry out this mission, Greubel Forsey selected Michel Boulanger, a certified French watchmaker and lecturer at the École d’Horlogerie de Paris. Since then, he has been learning traditional techniques to create a limited number of timepieces: a wristwatch with three hands with tourbillon and manual winder, made entirely by hand. During the SIHH 2014 in Geneva, Michel successfully presented a functioning prototype of the tourbillon cage.

Time Art Gallery
Inaugurated at the end of 2011 in the prestigious Bund18 building in Shanghai – a nerve centre for the contemporary arts, Time Art GalleryGF – is the fruit of a reflection on the points of convergence between the watchmaker’s art and contemporary art. It is an unconventional space designed primarily to exhibit Greubel Forsey creations and to showcase to the general public the spirit of invention which drives the brand.

Here, Greubel Forsey also exhibits the co-creations resulting from the luxury watch atelier’s collaborations with contemporary artists. For example, in 2012, Greubel Forsey has created The Art Piece 1 in partnership with British micro- sculptor Willard Wigan. In 2012, the exhibited the Art Piece 1 at the Shanghai Art Fair, the FIAC (International Contemporary Art Fair) in Paris, and at the California African American Museum (CAAM) in Los Angeles. In 2013, this exhibition was held in the Museum of Antiquities (Jaffa Museum) in Tel Aviv, Israel, then at the Museum of Modern Art in Saint-Étienne, France.

Time Art GalleryGF is an environment in which to exhibit the horological art of others. Certain master watchmakers are an inexhaustible source of inspiration because they truly embody the values of perfection and excellence that the brand hold dear. They evoke a lineage of sorts in transmitting a certain philosophy of watchmaking avant-gardism. Among these luminaries is acclaimed independent Philippe Dufour, who remains one of the staunchest defenders of traditional fine watchmaking and whose creations are characterised by superlative workmanship and sublime hand finishing. Also featured is the work of Vianney Halter who revolutionised the architecture of complicated watches by deconstructing them and whose multiple dials include aesthetic references to other domains.

Time line

  • 1999: After leaving Renaud & Papi, Robert Greubel and Stephen Forsey begin working together and soon realise that they share an identical vision of the tremendous untapped potential to invent new mechanisms and innovative movements in the field of Technical Haute Horlogerie.
  • 2001: Robert Greubel and Stephen Forsey create CompliTime SA in La Chaux-de-Fonds, an organisation entirely dedicated to the development of complicated movements for the prestige watch segment. In parallel, they prepare the launch of their own Greubel Forsey brand.
  • 2004: Their dream comes true as they present their Greubel Forsey brand and their first invention at Baselworld : the Double Tourbillon 30°, a patented movement specifically adapted to the wristwatch. The launch is successful and Greubel Forsey begins developing a highly selective network made up of the world’s finest retailers.
  • 2005:  The Inventor Watchmakers present their second patented invention: the Quadruple Tourbillon à Différentiel in which four Tourbillons are linked to a spherical differential. Greubel Forsey presents its EWT® – Experimental Watch Technology® research platform – a working method and a laboratory dedicated to the development of experimental watches.
  • 2006: At Baselworld, Greubel Forsey presents its third invention – the Tourbillon 24 Secondes Incliné, with a patented movement still in its initial experimental phase and which derives maximum advantage from the fast rotation of a single inclined Tourbillon cage. Robert Greubel and Stephen Forsey join forces with independent watchmakers Philippe Dufour, Vianney Halter and Kari Voutilainen to launch Time Aeon Alliance, which aims to support, promote and develop the Watchmaking Art at its highest level. To everyone’s surprise, Harry Winston and Greubel Forsey unveil the unexpected Opus 6 at the opening of Baselworld 2006. Richemont International S.A. acquires a minority shareholding in Greubel Forsey S.A. This partnership confirms the quality of the relationship with several Richemont Group companies that has been consistently cultivated by the Inventor Watchmakers Robert Greubel and Stephen Forsey for almost 20 years.
  • 2007: At this year’s Baselworld, Greubel Forsey extends its collection and presents the Double Tourbillon 30° Secret, a new version of the 2004 model. This time, the dance of two tourbillon cages can be viewed exclusively from the back of the case. The Invention Piece 1, created to honour the first Greubel Forsey invention, the Double Tourbillon 30°, symbolises more than four years of reflection that the two watchmakers have dedicated to researching and developing this new mechanism. The Invention Piece 1 will be issued in a unique edition comprising three series of 11 watches in white gold, red gold and platinum respectively. The Tourbillon 24 Secondes Incliné emerges from the EWT® and is presented in its asymmetrical white gold case with lateral window and dial in black or silver-coloured gold. 4th year, 4th invention: as part of its EWT® endeavours, Greubel Forsey presents the balance-and-spring binomial in diamantchrone®. The central idea behind this invention lies in associating the balance and spring with isochronically stable materials.
  • 2008: Presents Quadruple Tourbillon.
  • 2009: Presents Double balancier 35°. Presents Double Tourbillon 30° Technique and Invention Piece 3. The Double Tourbillon 30° Technique receives the ‘Grand Complication Watch’ prize at the Grand Prix d’Horlogerie de Genève. The brand wins the Gaïa Prize for Robert Greubel and Stephen Forsey’s ‘entrepreneurship’.
  • 2010: Presents Double Tourbillon 30° Edition Historique. The Double Tourbillon 30° “Édition Historique” wins the Aiguille d’Or award in the Grand Prix d’Horlogerie de Genève.
  • 2011: Presents Invention Piece 2 and launches GMT. Opens the Time Art Gallery in Shangai, China. The Double Tourbillon 30° Technique wins 1st prize in the International Chronometry Competition in Le Locle. Launches Le Garde Temps – Naissance d’une Montre project.
  • 2012:  Presents Art Piece 1. Launches Quadruple Tourbillon Secret and Tourbillon 24 Secondes Contemporain.
  • 2013: Unveils the Double Tourbillon Asymétrique, the Double Tourbillon Technique Titanium Black (the first Greubel-Forsey movement in titanium) and the Double Balancier 35°, Greubel Forsey’s first non-tourbillon movement.
  • 2014: Greubel-Forsey celebrates its 10th anniversary. Launches white gold, 5N red gold and platinum versions of GMT model. Presents Diamond set Tourbillon 24 Secondes Contemporain and Double Tourbillon 30° Technique Bi-colour. Introduces Robert Filliou Art Piece. Introduces the mechanical computer for the QP à Equation (7th invention).
  • 2015:  Unveils the unadorned Montre-ecole.

Contact details
Greubel Forsey
Eplatures-Grise 16 – P.O. Box 670
2301 La Chaux-de-Fonds – Switzerland
www.greubelforsey.com

Greubel Forsey Double Balancier Sapphire Limited Edition

When founding Greubel Forsey, Robert Greubel and Stephen Forsey focused all their energy on research and development, with the objective of improving the performance of their timepieces. Their efforts gave rise to many fundamental watchmaking advancements, which took concrete form as inventions, focusing particularly on chronometry.

The Double Balancier – Greubel Forsey’s sixth Fundamental Invention – is a phenomenal timepiece in many ways. Its principle: to drastically enhance timekeeping precision.

Robert Greubel and Stephen Forsey began exploring the Double Balancier – i.e. two fixed oscillators positioned along two different axes at precise predetermined angles – more than ten years ago in order to improve the average timing rate in stable positions. Thanks to the combined effects of the constant spherical differential and the angle of the balances, the effects of gravity are minimised by halving the margin of error and maximising timing precision, a development which resulted in two patents.

Light floods into the timepiece through its sapphire crystal case, which alone required over 900 hours of machining. This showcases the three-dimensional architecture from every angle and reveals the cleverly engineered and enhanced dial and movement with its myriad materials and finishes.

The mechanism reveals itself in its countless details, characteristic Greubel Forsey lines and very high levels of hand finishing performed on each and every component and surface. This pursuit of excellence can be found in even the most unlikely places, including the words central to the Greubel Forsey philosophy, which are engraved around the flanks of the movement itself.

The timepiece is truly brought to life with superior black polishing, satin finishing, circular-graining and superb hand-bevelling (with sharp internal angles). The dial side is certainly worthy of attention with its expertly hand-polished blue gold dial to obtain the celebrated flawless black polish that captures the light. The case back is equally deserving of admiration with its aesthetically balanced openings perfectly integrated into the mainplate.

These apertures highlight the differential bridge – which has been open-worked and integrated into the form of the mainplate – underlining the two regulating organs, which also feature extensive hand-bevelling and black-polished finishes.

This particularly harmonious creation is complemented by two distinctive gold plates engraved with the words “Greubel Forsey” and the individual number of each timepiece, and the setting of olive-domed jewels in polished gold chatons. The timepiece’s transparency is further enhanced by anti-reflective coatings on both sides of the crystals.

This timepiece was inspired by the phenomena of transparency and light. Within a case entirely crafted from sapphire crystal, the spectacular workings of the mechanism are revealed from every angle. The timepiece’s elegant open architecture enhances its components to unveil a stirring, visually striking spectacle. Every part of the timepiece has been lavished with uncompromising attention to detail. Even the crown is made from sapphire crystal and engraved with the distinctive “GF” mark. It has been carefully developed to ensure user comfort during winding, with its every detail being minutely analysed, from its diameter and thickness to the shape and number of its notches.

The polished white gold hands make it easy to read the time by day and by night thanks to the tips filled with Super-LumiNova®. At 2 o’clock, the dial’s 72-hour chronometric power reserve displays the remaining autonomy provided by the movement’s two barrels. Last but not least, the case’s distinctive design is punctuated by Greubel Forsey’s eight unique and original screws, which feature a characteristic notch shape and provide additional water-resistance (3 atm, equal to 30 m or 100 ft).The hand-wound movement incorporates 284 components, 30 of which comprise the Constant Spherical Differential. 71 components make up each of the two escapement platforms inclined at 30° angles. Power is supplied by two series-coupled fast rotating barrels, which provide the timepiece with optimum force throughout its 72-hour chronometric power reserve.

The two oscillators have variable inertia balances with gold mean-time screws and beat at 3Hz or 21,600 vibrations per hour. The nickel silver plates and bridges are frosted and spotted, with polished bevelling and countersinks, straight grained flanks and an anthracite grey PVD treatment.

The sapphire crystal case – featuring three dimensional, variable geometry-shaped lugs – measures 47.25 mm in diameter and 13.81 mm in height. The case back, bezel and case body are each entirely machined from a single piece of sapphire crystal.

The timepiece is complemented by a blue rubber strap, elegantly ribbed and inscribed with the exclusive Greubel Forsey signature on the upper surface, while on the inside in relief are the words pivotal to the Atelier’s philosophy. The strap is completed with a Greubel Forsey engraved folding clasp in titanium.

This Double Balancier Sapphire with mirror polished blue dial is issued as a Limited edition of just 11 pieces exclusively for the brand’s North American partners.

Technical details

Model: Double Balancier Sapphire
Limited edition: 11 pieces in sapphire

Movement

Hand-wound movement with 2 patents
Double Balancier • hours and minutes • small seconds •
4-minutes spherical constant differential rotation • power-reserve

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 8.15 mm

Number of parts
• Movement: 284 parts
• Escapement platform: 2 x 71 parts
• Spherical constant differential: 30 parts

Number of jewels
• 50
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheels
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance springs
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, grey PVD treatment

Bridges
• Nickel silver, spotted, with polished beveling and countersinks, straight-grained flanks, grey PVD treatment
• Flat black polished steel differential bridges
• Flat black polished gold centre bridge, with polished bevelling and countersinks, straight-grained flanks
• Two engraved gold plates (1x Greubel Forsey, 1x individual number)

Escapement platforms
• Inclined at a 30° angle
• Flat black polished steel, hand-polished beveling and countersinks, straight-grained flanks
• Polished steel pillars
• Flat black polished and barrel polished steel balance wheel bridges

Gearing
• Involute circle profile
• Inclined gear with profiled teeth

Displays
• Hours and minutes
• Small seconds
• 4-minutes spherical constant differential rotation
• 72-hours power reserve on a sector

Exterior

Case
In synthetic sapphire
Diameter: 47.25 mm
Height: 13.81 mm
Bezel, case and caseback machined from a block of sapphire, completely polished
Three-dimensional, variable geometry-shaped lugs
Gold sight ring, engraved on the periphery with the values of the brand, filled with lacquer
Engraving «Double Balancier» and «Greubel Forsey»
Engraved individual number
Water resistance of the case: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: Synthetic sapphire with engraved GF logo

Dial
Multi-level in gold, blue colour, flat black polished
Differential rotation and small seconds indicators in gold

Hands
Hours and minutes in polished gold, with Super-LumiNova
Small seconds, 4-minutes in polished blued steel
Power-reserve in polished gold

Strap and clasp
Hand-sewn alligator or rubber
Titanium folding clasp, engraved with the GF logo

Greubel Forsey Tourbillon 24 Secondes Vision Enamel

With the Tourbillon 24 Secondes Vision Enamel, Robert Greubel and Stephen Forsey materialise both neoclassicism and timelessness. This timepiece asserts an absolute purity of line while at the same time revealing a mechanical world of fine precision.

The Tourbillon 24 Secondes Vision in white gold was awarded the prestigious “Aiguille d’Or” in 2015, for the best timepiece in all categories, awarded by the Jury of the Grand Prix d’Horlogerie de Genève.

Greubel Forsey has taken up the challenge of reimagining the space for the inclined tourbillon cage of their third Fundamental Invention, the Tourbillon 24 Secondes, within a case of refined proportions.

Tourbillon 24 Secondes Enamel

The unprecedented solution lay in reconciling sophistication and simplicity with a vertical asymmetry: A dome has been incorporated into the sapphire crystal on the back of the timepiece, creating an extra volume to house the inclined tourbillon system. The shape and position of the dome has been conceived in such a way that it sits very comfortably on the wrist, completing the subtle alchemy between performance and ergonomics.

The Tourbillon 24 Secondes Vision Enamel houses Greubel Forsey’s third Fundamental Invention in a perfectly refined case. Its white Grand Feu enamel dial, infusing the timepiece with a striking luminosity, creates a poetic contrast with the fine blued steel hands and their delicately hand finished countersinks. Integrated into the case back, a sapphire dome reveals the inclined tourbillon cage whose bridges, like a semicircular Romanesque vault, represent a supreme technological and artisanal feat.

Tourbillon 24 Secondes Enamel

The ethereal composition of the timepiece as a whole highlights and heightens the Tourbillon 24 Secondes mechanism beating at its heart. Its fast rotation speed and inclined angle solve the problem of the critical positions of the oscillator in relation to gravity. The 25° angle and rapid revolution of the tourbillon cage significantly improve the chronometric performance, especially in stable positions of a system containing one tourbillon. In the Tourbillon 24 Secondes Vision Enamel, the intricate mechanism can be viewed thanks to a veritable stream of light, channelled into the interior of the timepiece by the sapphire crystal dome.

Among this timepiece’s most noteworthy features are its two curved tourbillon bridges, whose geometry resembles that of a Romanesque vault. The barreled polishing of the three-dimensional surfaces of the tourbillon’s arched bridges is taken to the very limit, revealing their famous black polish, a real human and technical feat requiring great talent and years of practice. In the hands of Greubel Forsey ‘s craftsmen, polishing is pursued until the perfect result of an incredibly deep jet black polish without reflection is achieved. This requires such a rare know-how that each bridge is discreetly signed by the individual movement finisher who decorated it.

Tourbillon 24 Secondes Enamel

With the Tourbillon 24 Secondes Enamel, Greubel Forsey presents, for the very first time, a Grand Feu enamel dial. A model of the artisan’s hand executed skillful craftsmanship, and the result of a delicate treatment that enhances its immaculate whiteness. This dial envelopes the whole timepiece in a magnificent aura of light and a noble simplicity, while the Roman hour numerals at six and twelve underline the neoclassical sophistication.

The prodigious timelessness and refinement of the aesthetics are confirmed by the delicately hand finished blued steel hands. They have been lightened to the maximum degree and their form, in the shape of a lance, leading the eye straight to the royal blue enamel indexes.

This timepiece comes in a 5N red gold case with a hand-sewn leather strap, secured by a pin buckle hand-engraved with the Greubel Forsey logo.

Technical details

Model: Tourbillon 24 Secondes Vision Enamel
In 5N red gold or in platinum or in steel

Movement

Mechanical hand-wound movement with patented tourbillon Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 7.09 mm

Number of parts
• Movement: 293 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.38 g

Number of jewels
• 41
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Motor wheel with relief engraving, black treatment

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Engraved gold plate with individual number
• Arched and barrel-polished steel tourbillon bridges

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion

Displays
Hours and minutes
Small seconds
72-hours power-reserve on a gold sector (caseback side)

Exterior

Case
In 18k 5N red gold or in platinum 950 or in steel with convex synthetic sapphire crystal
Diameter: 43.50 mm
Height: case 13.65 mm (height on synthetic sapphire dome 16.03 mm)
Transparent back with 2 convex synthetic sapphire crystals
Three-dimensional, variable geometry-shaped lugs
Raised polished engraving “Tourbillon 24″ Incliné” and “Greubel Forsey” on a hand-punched background
Gold security screws
Hand-polished bezel, caseband with hand-finished straight-graining
Hand-engraved individual number (18k 5N red gold and platinum 950 versions)
Water-resistant 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In 18k 5N red gold or in platinum 950 or in steel with engraved and black lacquered GF logo

Dial
White enamel Grand Feu with numbers and indexes in navy blue enamel
GF logo in black enamel

Hands
Hours, minutes, small seconds and power-reserve in blued polished steel, hand-polished countersinks

Strap and clasp
Hand-sewn alligator
18k 5N red gold or platinum 950 or steel pin buckle, hand-engraved with the GF logo (18k 5N red gold and platinum 950 versions)

Greubel Forsey Différentiel d’Égalité White Gold Limited Edition

Created after years of research and development, this new timepiece by Robert Greubel and Stephen Forsey, contains their 5th Fundamental Invention: the Différentiel d’Égalité. It ensures a regulated driving force and improves the accuracy of the timing performance. It is also the first time that Greubel Forsey has integrated a dead-beat second in one of its timepieces.

Robert Greubel and Stephen Forsey first unveiled their invention at Baselworld 2008 as part of the EWT Laboratory and then presented a more advanced version of a technical demonstrator at SIHH 2010. Since then, further exciting paths have been explored to help optimise accuracy in this new timepiece. The Différentiel d’Égalité enables steady distribution of power from the mainspring barrel to the regulating organ, which maintains a constant balance amplitude during the 60 hours of the power reserve.

In a first for Robert Greubel and Stephen Forsey, this timepiece features dead-beat seconds. This makes it easier to read and to set the time precisely. The timepiece is equipped with a balance wheel stop and seconds reset activated by pulling the crown. The heart and the hammer of this mechanism are visible on the movement side.

The 30° angle of the balance wheel and escapement minimises the effects of gravity and ensures efficient movement performance in stable positions. This Greubel Forsey technique guarantees excellent mean/averaged balance wheel performance, which is the mark of heightened timekeeping accuracy.

The aesthetics of this timepiece flow from everything that’s purest in Greubel Forsey’s mechanical spirit. A large opening in its dial allows a glimpse of all the beauty and complexity of the movement.

The dial side has a high-domed sapphire crystal that gives this new creation a refined silhouette. The movement side shows the “stop/reset” mechanism and the engraved inscriptions which encapsulate the key values that Robert Greubel and Stephen Forsey instill in their creations.

This white gold edition is limited to 33 pieces.

Technical details

Model: Différentiel d’Égalité
Limited edition of 33 pieces in white gold

Movement

Hand-wound movement with patented spherical Différentiel d’Égalité
Spherical Différentiel d’Égalité • inclined fixed escapement • hours and minutes • dead-beat seconds • small seconds • power-reserve • stop balance wheel and reset on dead-beat seconds

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 9.99 mm

Number of parts
• Movement: 359 parts
• Inclined fixed escapement: 71 parts

Number of jewels
• 47
• Olived-domed jewels in gold chatons

Spherical Différentiel d’Égalité
• 24 parts including 4 jewels and 3 satellites
• Differential cage, circular-grained, polished bevelling and countersinks, straight-grained flanks
• Uniform torque, rewinding once per second with integrated spring

Chronometric power reserve
• 60 hours ± 10%
• Optimized amplitude over the entire power reserve
• Stopwork mechanism

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Barrel with relief engraving “Greubel Forsey”

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plate
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• Flat black polished gold plate with raised engraved text, polished bevelling and countersinks, straight grained flanks with gold chatons
• Circular-grained gold plate with individual number, polished bevelling and countersinks, straight grained flanks

Reset-seconds mechanism
• Stop balance and reset-seconds activated by crown
• Flat black polished steel reset-seconds mechanism, polished bevelling, straight grained flanks

Inclined fixed escapement
• Inclined at 30°
• Flat black polished steel lower bridge, polished bevelling and countersinks, straight-grained flanks
• Polished steel pillars
• Flat black polished steel balance wheel bridge, barrel-polished, polished bevelling and countersinks, straight-grained flanks

Gearing
• Involute circle profile
• Spherical Différentiel d’Égalité with conical gearing
• Conical profiled teeth for inclined fixed escapement

Displays
• Hours and minutes
• Dead-beat seconds
• Small seconds
• 60-hours power reserve on a sector

Exterior

Case
In white gold with high domed synthetic sapphire crystal
Diameter: 44.00 mm
Height: 15.30 mm
Transparent back with synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Raised polished engraving “Différentiel d’Égalité” and “Greubel Forsey” on a hand-punched background
Gold security screws
Hand-polished bezel, caseband with hand-finished straight graining
Hand-engraved individual number
Water resistance of the case: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In white gold with engraved and black lacquered GF logo

Dial side
Multi-level synthetic sapphire hour-ring, lacquered galvanic growth hour indexes, engraved and lacquered minutes and small seconds
Small seconds and power-reserve indicators in gold, engraved and lacquered, hand matt lapped

Hands
Hours and minutes in gold with Super-LumiNova
Small seconds, dead-beat seconds and power-reserve in polished blued steel, hand-polished countersinks

Strap and clasp
Hand-sewn alligator
White gold folding clasp, hand-engraved with the GF logo

Greubel Forsey GMT Earth Limited Edition, White Gold Case

The GMT Earth timepiece from Greubel Forsey offers a comprehensive, three dimensional view of the terrestrial globe, from the North to the South Poles. They approached the architecture of this timepiece from a different angle to give the movement and the case a more prominent role.

With this new creation, Robert Greubel and Stephen Forsey are once again pushing the envelope and venturing into uncharted territories. The GMT Earth provides an amazing 360° view of our planet Earth all the way from the North to the South Pole. This technical feat was achieved by an original movement architecture in relation to the case shape and dimensions. Revealing the entire terrestrial globe required complex application of sapphire crystal, a skill which Greubel Forsey has acquired over many years of research and utilization.

The globe is not the only three-dimensional element in this timepiece – it’s a characteristic that features at every level. The three-dimensionality first appears at the highest point of the dial, with the hour, minute and small seconds indications. Then the gaze glides gently across the GMT indication with its triangular red hand, followed by the power reserve indication displayed by a long, slender hand. Finally, our eyes come to rest on the lowest part of the dial, which shows the globe alongside the Tourbillon 24 Secondes, Greubel Forsey’s 3rd pivotal Invention.

The GMT Earth enables a clear view of three time zones simultaneously to within a quarter of an hour. Furthermore, on the movement side of the timepiece, 24 time zones are displayed with the summer and winter times to complement the universal time indicated by the terrestrial globe.

The proportions of the case were constructed to accommodate the high-domed sapphire crystal bezel and the special artistry on the caseband. The characteristic lateral plates bearing engraved inscriptions that encapsulate the key values of Robert Greubel and Stephen Forsey decorate the case body. This white gold edition is limited to 33 pieces.

Technical details

Model: GMT Earth
Limited edition of 33 pieces in white gold

Movement

Hand-wound movement with 3 patents
GMT • 2nd time zone • rotating globe with universal time and day-and-night • complete and global view from northern to southern hemisphere • universal time on 24 time zones • summer and winter time • cities observing summer time • lateral window showing the equator • GMT pusher • Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 11.55 mm

Number of parts
• Movement: 453 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.39 g

Number of jewels
• 60
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Nickel silver, frosted with polished beveling and countersinks, straight-grained flanks, nickel-palladium treatment
• Flat black polished steel tourbillon bridge, hand-polished bevelling and countersinks
• Flat black polished steel screws, blued by heat treatment

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion

Displays
• Hours and minutes
• Small seconds
• 72-hours power reserve on a sector
• 2nd time zone GMT
• 24 time zone universal time
• Rotating titanium globe with universal time
• Complete view from North Pole to South Pole
• Summer time
• Day-and-night

Exterior

Case
In white gold, with 18k gold plates, engraved, hand-finished with text, screwed to the caseband
Diameter: 45.50 mm
Height: case 16.18 mm (height on synthetic sapphire dome 18.00 mm)
Lateral window with shaped synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Three-dimensional synthetic sapphire crystal caseback, with integrated dome
Three-dimensional, asymmetrical, synthetic sapphire crystal bezel
Raised polished engraving “GMT Earth” and“Greubel Forsey” on a hand-punched background
Gold security screws
White gold GMT pusher with raised engraving on a hand-punched background
Hand-engraved individual number
Water resistance of the case: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In white gold, synthetic sapphire insert with GF logo

Dial side
Multi-level hour-ring in synthetic sapphire, galvanic growth hour indexes, engraved and lacquered minutes and small seconds
Power-reserve and GMT indicators in gold, engraved and lacquered, hand matt lapped
Rotating globe with day-and-night UTC indicator in synthetic sapphire, engraved and lacquered

Movement side
Synthetic sapphire disc displaying city names surrounded by 2 gold rings (UTC and summer time) engraved and lacquered
Gold “summer time” plate with individual number, raised engraving
South Pole of the globe with UTC indicator, engraved and lacquered, hand matt lapped

Hands
Hours, minutes, small seconds and power-reserve in polished steel, black treatment, hand-polished countersinks
2nd time zone GMT indicator, red triangle

Strap and clasp
Black rubber or hand-sewn alligator
White gold folding clasp, hand-engraved with the GF logo

Greubel Forsey presents the first Nano Foudroyante EWT

Following intense research on the mastery of nano-energy within the context of their Mechanical Nano project, Greubel Forsey announces a new breakthrough in mechanical watchmaking and presents the first Nano Foudroyante EWT.

Mechanical Nano – Nano Foudroyante EWT

Mechanical Nano applied to the foudroyant jumping seconds.
• LESS ENERGY USED – a reduction in the amount of energy consumed by a factor of 1,800
• LESS SPACE USED – 96% less compared to a conventional mechanism
• RENEWED INVENTIVENESS – example: patent fling No.: EP 3220207 A1

From tower clocks to wristwatches, the history of clock- and watch-making over the past four centuries chronicles the ever-increasing miniaturisation of mechanisms. Up until now, the power needed to drive a wristwatch mechanism has been a limiting factor in terms of design and innovation.

Greubel Forsey’s fundamental work on Mechanical Nano, based on the mastery of energy and available space, is once again confirmed and now applied in a watch mechanism.

In the process of developing the 180-day power reserve movement, the decision was taken to apply Mechanical Nano to the foudroyant jumping seconds mechanism. This watchmaking complication consists of a hand that makes one rotation every second to indicate the fractions of a second.

For over ten years, Greubel Forsey’s EWT (Experimental Watch Technology) Laboratory has been working to push the boundaries of mechanical watchmaking and has had particular success in the domain of the Mechanical Nano project. Thanks to this totally new concept and following the recent application of patent No. EP 3220207 A1, Greubel Forsey is unveiling the first Nano Foudroyante EWT.

Mechanical Nano has led Robert Greubel and Stephen Forsey, as well as the engineers and designers at Greubel Forsey, to completely rethink the mechanism of the traditional foudroyant jumping seconds.

Nano Foudroyante EWT (Mechanism)

This new construction consists, first of all, of a mobile with a very low moment of inertia, which takes its information directly from the escape wheel. This principle means that a full gear train is no longer needed to ensure the sub-division of seconds, since the information is obtained from the wheel, which distributes and gives the rhythm to the energy of the movement. Energy consumption can now be expressed in nanojoules (nJ).

Nano Foudroyante EWT (Mechanism)

This first Mechanical Nano watchmaking application focuses on the reduction of inertia and on the energy savings it made possible. The display of the Nano Foudroyante EWT is by a miniature hand. This is made clearer to read by an optical system with 23x magnification. Practical EWT Laboratory tests confirm the theory and calculations, corroborating the studies on the savings of energy and space. On the basis of this first demonstrator there are a number of different innovative possibilities that will enable further optimization of energy.

Mechanical Nano – Nano Foudroyante EWT

Compared to a traditional foudroyant jumping seconds mechanism, the Greubel Forsey Nano Foudroyante EWT consumes 1,800 times less energy and occupies 96% less space. All of this research has made it possible to create a truly original and innovative foudroyant jumping seconds mechanism that makes best use of energy and available space in the movement of a mechanical timepiece.

Mechanical Nano – Nano Foudroyante EWT

Having initiated the project over a decade ago, research and development on a movement with a 180-day power reserve is still going strong.

Following validation of the reduction of inertia with this demonstrator, Greubel Forsey’s EWT Laboratory is currently working on validating a Nano Foudroyante based on the same fundamental principles, where the foudroyant jumping seconds is displayed on a standard size subdial: the Nano Foudroyante à Afchage. The practical results obtained from this research will be featured in an upcoming publication.

Sharing is a value that is dear to both Robert Greubel and Stephen Forsey. To that end, progress on Mechanical Nano research will be made public at regular intervals.

Greubel Forsey QP à Équation Millesimé Edition (White Gold case, Rhodium-Coloured Gold Dial)

The Greubel Forsey QP à Équation timepiece, which was created after seven years of research, the assembly of no fewer than 624 parts, three patents, and the combination of two inventions, revolutionises one of the oldest watchmaking complications, the perpetual calendar, by incorporating an equation of time. To create this watchmaking complication, Greubel Forsey has developed a Mechanical Computer: this enabled ergonomics and readability of the various functions to be simplified, and for all corrections – including days – to be made rapidly by turning the bi-directional crown.

The QP à Équation houses Greubel Forsey’s seventh invention, the Mechanical Computer, an entirely integrated 25-part component that brings a totally new interpretation to some of the calendar functions incorporated in age-old astronomical clocks. It is composed of a set of coding wheels superimposed in a coaxial manner, along with removable fingers programmed by this ingenious system.

Depending on their rotation speeds and number of teeth, these wheels provide a variety of information. The Mechanical Computer also directly drives a system of sapphire disks that displays the equation of time, i.e. the difference between the “real” solar time and civil time.

Paramount to this was simplifying the way all the indications can be corrected by turning the bi-directional crown. Despite its multiple functions and displays, added to its combination of three patents and two inventions, Greubel Forsey’s QP à Équation Millésimé remains as easy to set as a simple calendar.

The dial of the QP à Équation indicates leap years, the 24 hours of the day and night, the day of the week, the large date, the month, the hours, the minutes and the seconds, as well as the chronometric 72-hour power reserve. On the movement side, this timepiece displays the equation of time with the months, seasons, solstices and equinoxes, as well as the calendar year.

This new interpretation of the perpetual calendar features the Equation of Time incorporated within it, along with the addition of new functions and displays that aim to optimise readability and pleasure of use.

Three apertures lined up in the sub-dial at 3 o’clock give an unequivocal indication of the day, date and month for enhanced visual comfort. The large date boosts readability, making it especially easy to make out the elements of the calendar.

The timekeeping of this timepiece relies on Greubel Forsey’s third invention: the Tourbillon 24 Secondes, which uses a fast rotation speed and inclined angle to solve the problem of critical positions of the oscillator in relation to gravity. A 25° angle and the rapid revolution of the tourbillon cage significantly improve the chronometric performance of a system containing only one tourbillon, especially in stable positions.

The QP à Équation is available in a Millesimé Edition with a rhodium-coloured gold dial. This new Millésime’s white gold case measures 43.5mm by 16 mm thick and provides a simplified linear display.

Technical details

Model: QP à Équation
In white gold – Millésimé
Anthracite or rhodium-coloured dial

Movement

Hand-wound movement with 4 patents
Bidirectional perpetual calendar • day, date, month, calendar year, leap year, day/night • equation of time with month, season, solstice and equinox • function selector • Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement dimensions
Diameter: 36.40 mm
Thickness: 9.60 mm

Number of parts
Movement: 624 parts
Tourbillon cage: 86 parts
Weight of the cage: 0.37 g

Number of jewels
• 75
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• 4 engraved gold plates, one with the individual number
• Flat black polished steel tourbillon bridges
• Synthetic sapphire mechanical computer bridge

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion

Dial displays
• Hours and minutes
• Small seconds
• 72-hours power reserve on a sector
• Day of the week, large date and month
• Leap year
• Day-and-night with red safety zone
• Function selection (perpetual calendar or H/M time adjustment)

Back displays
• Equation of time with month, season, solstice and equinox
• Calendar year

Exterior

Case
In white gold with asymmetrical convex synthetic sapphire crystal
Diameter: 43.50 mm
Height: 16.00 mm
Transparent back with asymmetrical synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Raised polished engraving “QP à Équation” and “Greubel Forsey” on a hand-punched background
Gold security screws
Polished bezel, caseband with hand-finished straight graining
Hand-engraved individual number
Water resistance of the case: 3 atm – 30 m – 100 ft
Crown: In white gold with engraved GF logo

Dial
Multi-level gold dial, anthracite or rhodium-coloured
Gold hour markers
Small second, power-reserve and leap year in gold
Gold perpetual calendar aperture with polished raised engraving
Gold GF logo

Hands
Hours and minutes in polished gold or black treatment, with Super-LumiNova
Small seconds, power-reserve and leap year indicator hand in polished blued steel or black treatment

Strap and clasp
Hand-sewn alligator
White gold folding clasp, hand-engraved with the GF logo

Greubel Forsey Tourbillon 24 Secondes Edition Historique

Following on from the Double Tourbillon 30° in 2010, Greubel Forsey is now celebrating the Tourbillon 24 Secondes Asymétrique by releasing a specifically dedicated Edition Historique. This closes the Tourbillon 24 Secondes Asymétrique collection, whose models have been produced at an average rate of 18 pieces per year since 2007.

There are three versions of the Tourbillon 24 Secondes to date: the Asymétrique, Contemporain and Vision models. Greubel Forsey has decided to pay homage to the first of these three versions, the “Tourbillon 24 Secondes Asymétrique”, by creating a Unique edition: the Tourbillon 24 Secondes Edition Historique.

For this timepiece, the architecture of the dial was entirely reinterpreted and redesigned with a 3D engraved text that reveals the Greubel Forsey philosophy. The sectoral seconds and power reserve displays have also been redesigned. These two display systems have never before been featured in a Tourbillon 24 Secondes timepiece.

The Asymétrique was the model that made it possible to incorporate the Tourbillon 24 Secondes – Greubel Forsey’s third Fundamental Invention, visible at 8 o’clock – into a timepiece for the first time. This then paved the way for the Contemporain and Vision versions. The latter model played an important role in the history of Greubel Forsey as it was awarded the Grand Prix de l’Aiguille d’Or in 2015. This is one of the reasons for this tribute.

Following on from the Double Tourbillon 30° Edition Historique unveiled in 2010, this is the second time that a Greubel Forsey timepiece has been honoured as an Edition Historique, marking an end to a collection.

The timepiece exists in two versions: with a 5N red gold case or a platinum case. Meanwhile the dial features a silver-toned (red gold version) or anthracite (platinum version) multi-level gold finish. This timepiece will be available in two Unique editions of 11 pieces.

Greubel Forsey Tourbillon 24 Secondes Vision Platinum – Chocolate, Blue and Anthracite Black dials

Greubel Forsey recently extended the Tourbillon 24 Secondes Vision range with a “Salmon” dial. It is now available in three new versions: “Chocolate”, “Blue” and “Anthracite Black”. One timepiece with four different faces: it is a unique situation as, usually, Greubel Forsey only creates one edition of each of its platinum timepieces. These versions follow the success of the Tourbillon 24 Secondes Vision, which was awarded the Aiguille d’Or 2015 by the jury of the Grand Prix d’Horlogerie de Genève.

During the creation of the Tourbillon 24 Secondes Vision, Robert Greubel and Stephen Forsey were confronted with a major challenge: how to house the mechanism of the Tourbillon 24 Secondes without sacrificing the timepiece’s pure, elegant lines. In other words, how could they reconcile sophistication with simplicity? The solution was achieved by giving the case’s design a subtle, vertical asymmetry.

By incorporating a sapphire crystal dome into the back of the timepiece, the model’s inventor-watchmakers were able to generate the volume required to house the tourbillon mechanism, thus leading to a perfect alchemy between performance and comfort. Over and above its showcase function, the sapphire dome captures luminosity and channels it into the interior of the timepiece, allowing the tourbillon to be viewed through a veritable stream of light.

Among this timepiece’s most noteworthy features are its two curved tourbillon bridges, with their delicately hand-polished surfaces. To attain such symmetrical perfection in the finishes of the three-dimensional tourbillon bridges is no mean achievement, and indeed each bridge is discreetly signed by the artisan decorator who has executed it – a good way to celebrate the excellence of such watchmaking craftsmanship. Furthermore, in keeping with the highest standards, the movement’s 293 parts, whether visible or not, feature the very best hand finishing that can be found today.

The multi-level gold dial of this timepiece, in Chocolate, Blue or Anthracite Black, features engraved indexes (or gold appliqués depending on the version) filled with grand feu (champlevé) enamel. The hour, minute and small seconds hands are made of polished steel, which is blued in some of the versions. The countersinks are polished by hand.

The Tourbillon 24 Secondes Vision in platinum will be realised in small editions of a few pieces each year.

Technical details

Model: Tourbillon 24 Secondes Vision In platinum
(Chocolate, blue, or black-anthracite dial according to the version)

Note: This model is also available with a Salmon coloured dial)

Movement

Mechanical hand-wound movement with patented tourbillon
Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 7.09 mm

Number of parts
• Movement: 293 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.38 g

Number of jewels
• 41
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Black PVD-treated motor wheel with relief engraving

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• 1 engraved gold plate (individual number)
• Arched and barrel-polished steel tourbillon bridges

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion

Displays
• Hours and minutes
• Small seconds
• 72-hours power-reserve on a gold sector (caseback side)

Exterior

Case
• In platinum 950 with convex synthetic sapphire crystal
• Transparent back with 2 convex synthetic sapphire crystals
• Three-dimensional, variable geometry-shaped lugs
• Raised polished engraving “Tourbillon 24″ Incliné” and “Greubel Forsey” on a hand-punched background
• Gold security screws
• Hand-polished bezel, caseband with hand-finished straight graining
• Hand-engraved individual number
• Diameter: 43.50 mm
• Height: case 13.65 mm (height on synthetic sapphire dome 16.03 mm)
• Water-resistant 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
• In platinum 950 with engraved and black lacquered GF logo

Dial
• Multi-level in gold, colour: chocolate, blue or black-anthracite versions, with engraved (or gold markers according to the version) and “oven fired” enamelled indexes (émail grand feu champlevé)
• Gold GF logo

Hands
• Hours, minutes and small seconds in polished steel, blued according to the version, hand-polished countersink
• Power-reserve in blued polished steel

Strap and clasp
• Hand-sewn alligator
• Platinum 950 pin buckle, hand-engraved with the GF logo

Greubel Forsey “The Balancier” Limited Edition

Greubel Forsey welcomes their new horological masterpiece, the “Balancier”, which perfectly embodies the watchmakers’ fundamental principles. Greubel Forsey was bound one day to create a timepiece of great purity, featuring a unique and original balance wheel. Their creativity is immediately evident in the asymmetry of its case, which has almost become a constant of Greubel Forsey’s universe. Every detail of the “Balancier” carries the unmistakable stamp of a true Greubel Forsey timepiece – the watchmaking Maison’s values are manifest in the refinement and purity of its lines and dial, the inventive architecture of its balance wheel, the sharp profile of its hands, and the engraving on the reverse of the timepiece.

The watchmakers’ inventiveness is strongly in evidence in the new balance wheel. It was entirely developed and made at the Atelier, with its six gold mean-time screws, and it boasts remarkable aerodynamic qualities. The technical nature of this balance wheel generates exceptional regulating power, a mark of great chronometric stability.

Outstanding workmanship is very dear to Robert Greubel and Stephen Forsey, and it shines through in the wholly hand-executed barrel-polishing, bevelling and finishing of the balance wheel bridge. Such operations require prodigious expertise and know-how, particularly for the hand decoration of all the parts. The hand-countersunk and polished centres of the flame-blued steel hands offer another example of mastery in the craft, while the engraved gold plates on the back of the timepiece are also a pure masterpiece of hand-finishing skills.

The “Balancier” is available in a limited edition of 33 pieces in its white gold version.

Greubel Forsey Art Piece 2 – Edition 2

The Art of Invention: this expression testifies to a forward-looking philosophy that has long been a driving force for Robert Greubel and Stephen Forsey, both in the field of scientific research as applied to fine watchmaking, and in that of aesthetic innovation. This art of invention is particularly present when it comes to the stunning Art Piece series.

The Art Piece 2 – Edition 2 pushes back the boundaries of creativity even further. In this first Art Piece produced without an optical system (and therefore without a micro-sculpture or nano-engraving), the Double Tourbillon 30° appears to be a moving sculpture.

Here, the indication of time is secondary: a push-piece that controls a bistable mechanism needs to be activated in order to obtain an indication of the hours and minutes. The power reserve takes precedence over all other information with the aim of altering our relationship with temporality: it is not the current time that we contemplate, but the time remaining. This subtle metaphysical shift is naturally reminiscent of memento mori. This timepiece, signed by Robert Greubel and Stephen Forsey, will be realised in a limited edition of only a few pieces per year.

Greubel Forsey Signature 1 Platinum

After presenting red gold and white gold models from the Signature 1 series in last year, Greubel Forsey now offers a new platinum version of the watch with an anthracite black-coloured gold dial.

Long-time team member at Greubel Forsey, Didier Cretin inaugurated the Signature series in 2016, for which one watchmaker, chosen for their talent and original approach to watchmaking, creates their own timepiece within Greubel Forsey’s universe and cosigns it with Robert Greubel and Stephen Forsey. This project, which aims to showcase watchmaking skills, is reminiscent of the Naissance d’une Montre project, which archives techniques that are starting to disappear.

Didier Cretin designed a hand-wound watch with three hands, without a tourbillon function, which instead features an exclusively designed Greubel Forsey balance wheel. In this new version in platinum, the off-centred placement of its dial in anthracite black-coloured gold forms a contrasting counterpoint to the mechanical contents.

The dial, minimal and flat, invites the eye to explore the interwoven lines of the watch’s metallic, architectural depths. The hour-ring and minute-circle appear in white. An individual number is engraved by hand on the back of the timepiece. A total of eleven platinum Signature 1 pieces will be produced.

Greubel Forsey Grande Sonnerie

Realised after eleven years of R&D and comprising 935 parts, the Grande Sonnerie is Greubel Forsey’s most complex creation to date. For their very first Grande Sonnerie, the prestigious watchmaking house founded by Robert Greubel and Stephen Forsey has filed two patents. Dressed in a titanium case it houses an acoustic resonance cage and eleven security functions.

This Grande Sonnerie has powerful acoustics. It is water resistant to 3 atm. It is ergonomically designed for optimum ease of use, while an exceptional repeater power reserve enables it to run for about twenty hours in “Grande Sonnerie” mode. The timepiece is equipped with a silent striking regulator and a Tourbillon 24 Secondes, all housed within the standard dimensions of a Greubel Forsey case.

The most important elements and indications (such as the tourbillon, the cathedral gongs, the striking hammers, and the power reserve and mode indicators) were incorporated with the greatest care to ensure architectural balance. The watch designers succeeded in housing the 935 parts comprising this timepiece and its exterior in a space measuring 43.5 mm in diameter and 16.13 mm high.

The movement is manually wound, but the striking mechanism features a self-winding system which provides about 20 hours of power reserve in Grande Sonnerie mode. The minute repeater and its additional striking mechanism sound the exact time on demand, down to the minute. Beating at 21,600 vibrations per hour, the movement assures a 72-hour chronometric power reserve.

This timepiece has three modes to choose from: Grande Sonnerie (which strikes the hours and the quarters in passing), Petite Sonnerie (which strikes the full hours in passing) and Silence (which does not strike in passing). The pure and rich sound of the Grande Sonnerie is enhanced by an acoustic resonance cage made from titanium. Only five to eight pieces of this timepiece will be realised a year.

Greubel Forsey Tourbillon 24 Secondes Vision In Platinum Case with Salmon Colored Dial

The Tourbillon 24 Secondes Vision timepiece by Greubel Forsey is now available in a new model featuring Platinum case with salmon colored dial. Equipped with a mechanical hand-wound movement featuring a patented 24-seconds tourbillon inclined at a 25° angle, this timepiece boasts a multi-level in gold, featuring salmon color, with engraved and “oven fired” enamelled gold applied indexes and small seconds counter.

Tourbillon 24 Secondes Vision

Technical details

Movement

Mechanical hand-wound movement with patented tourbillon
Tourbillon 24 Secondes • hours and minutes • small seconds • power-reserve

Movement dimensions
• Diameter: 36.40 mm
• Thickness: 7.09 mm

Number of parts
• Movement: 293 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.38 g

Number of jewels
• 41
• Olived-domed jewels in gold chatons

Chronometric power reserve
• 72 hours

Barrels
• Two series-coupled fast rotating barrels (1 turn in 3.2 hours), one of which is equipped with a slipping spring to avoid excess tension
• Motor wheel with relief engraving, black treatment

Balance wheel
• Variable-inertia with gold mean-time screws (10 mm diameter)

Frequency
• 21’600 vibrations/hour

Balance spring
• Phillips terminal curve
• Geneva-style stud

Main plates
• Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment

Bridges
• Nickel silver, frosted and spotted with polished bevelling and countersinks, straight-grained flanks, nickel-palladium treatment
• 1 engraved gold plate (individual number)
• Arched and barrel-polished steel tourbillon bridges

Tourbillon
• Inclined at a 25° angle, 24-seconds rotation
• Light alloy cage pillars
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Tangential inclined gear on fixed wheel and profiled teeth on escape wheel pinion

Displays
• Hours and minutes
• Small seconds
• 72-hours power-reserve on a gold sector (caseback side)

Exterior

Case
• In platinum 950 with convex synthetic sapphire crystal
• Transparent back with 2 convex synthetic sapphire crystals
• Three-dimensional, variable geometry-shaped lugs
• Raised polished engraving “Tourbillon 24″ Incliné” and “Greubel Forsey” on a hand-punched background
• Gold security screws
• Hand-polished bezel, caseband with hand-finished straight graining
• Hand-engraved individual number
• Diameter: 43.50 mm
• Height: case 13.65 mm (height on synthetic sapphire dome 16.03 mm)
• Water-resistant 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)

Crown
• In platinum 950 with engraved and black lacquered GF logo

Dial
• Multi-level in gold, salmon color, with engraved and “oven fired” enamelled gold applied indexes (émail grand feu champlevé)
• Gold GF logo

Hands
• Hours, minutes and small seconds in blued polished steel, hand-polished countersink
• Power-reserve in blued polished steel

Strap and clasp
• Hand-sewn alligator
• Platinum 950 pin buckle, hand-engraved with the GF logo

Greubel Forsey Double Tourbillon 30° Technique Sapphire

Transparency has always been an integral part of Greubel Forsey creations. This is particularly true of the Double Tourbillon 30° Technique construction. With its three dimensional architecture, the movement mechanism was built in such a way that it encourages unobstructed observation of each separate element and their dynamic interactions.

Designed and developed from the ground up, the central idea behind the Double Tourbillon 30° Technique was to allow panoptic observation of as much of the movement architecture as possible.

The Double Tourbillon 30° Technique Sapphire takes this idea to its logical conclusion, offering full and pure transparency in viewing the mechanism. Carefully machined from a single large sapphire crystal, the case allows full access to the multi-leveled architecture from all possible angles. The entire movement is flooded with light, rewarding the viewer with an ever-changing spectacle of synchronized rotations, carefully balanced components and sublimely finished micro-mechanics within.

Gazing down through the multiple levels of the timepiece, the viewer is naturally drawn from one element to the next, ever-incited to enjoy yet another vista. Instead of assembling several smaller crystals, Greubel Forsey has taken on the challenge of crafting the entire case, including the rounded, multi angular case horns, from one single sapphire crystal.

The Double Tourbillon 30° Technique Sapphire was unveiled on Wednesday, June 15, 2016 and will be offered to the US market in a limited quantity for a limited time only