Vacheron Constantin Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph

Vacheron Constantin has created a unique Les Cabinotiers timepiece endowed with a minute repeater equipped with a centripetal flying strike regulator and a split-seconds monopusher chronograph.

Equipped with the new manual-winding in-house Calibre 2757, this unique Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph is in keeping with the grand tradition of Vacheron Constantin’s complicated watches.

The construction of this calibre, which consists of integrating an additional split-seconds chronograph mechanism into a basic minute repeater movement, represents a technical feat. The combination of these functions with a tourbillon has rarely been seen in the world of pocket watches, is almost non-existent in the world of wristwatches, and represents a first for Vacheron Constantin in a wristwatch.

Vacheron Constantin Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph

This timepiece is also distinguished by a concern for the purity of the dial and the legibility of its chronograph functions. The tourbillon is visible only through the case back, while the off-centre display of the time and chronograph indications highlights the two central chronograph hands. The presence of a minute repeater is revealed by the slide-piece positioned on the left-hand side of the watch.

As early as 1819, Vacheron Constantin produced a pocket watch with independent deadbeat seconds and quarter repeater, at the time one of the first of its kind, which is now kept in the private collection of the Maison.

Vacheron Constantin Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph

The deadbeat seconds mechanism, which allows the central second hand to advance in one-second jumps, played an important role in the measurement of short times. By making this mechanism independent by means of an additional gear train, watchmakers developed what is considered the ancestor of the chronograph towards the end of the 18th century. With such a device, it is now possible to stop the seconds hand without affecting the time indications.

The split-seconds chronograph was first introduced with a single-hand system in 1831, followed by the two-hand configuration in 1838. Vacheron Constantin quickly integrated these developments into the pocket chronographs of the time, as confirmed by an 1889 split-seconds timepiece dispatched to Buenos Aires for a horse racing enthusiast.

Vacheron Constantin’s watchmakers have developed the 698-component manual-winding Calibre 2757. Such a large number of parts denote a rare degree of horological complexity. Even in the world of grand complications, calibres are often of simpler design and made with far fewer components.

Vacheron Constantin Calibre 2757 Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph

Given this intensely technical nature, Vacheron Constantin’s watchmakers have nonetheless risen to the challenge of elegance by successfully arranging the complications of this timepiece within a remarkably slender movement measuring barely 10.4 mm thick and 33.3 mm in diameter.

Calibre 2757, operating at a rate of 18,000 vibrations per hour (2.5 Hz) and endowed with an approximately 60-hour power reserve, enables short time measurement with 1/5th of a second precision appearing on the graduated minute-track. The unusual configuration of the dark grey dial has been designed to ensure optimum visibility of the split-seconds chronograph.

The hours and minutes are displayed on an offset subdial, leaving room for the 30-minute chronograph counter prominently placed at 2 o’clock. The layout is complemented by small seconds at 6 o’clock, indicating that the watch is in operation, thereby leaving plenty of space for the two central chronograph hands.

The very construction of the movement, particularly in terms of its chronographic functions, is based on the imperative of performance. In the watchmaking world, where many great inventions belong to the past, innovation often consists in optimising the operation of a calibre.

Vacheron Constantin Calibre 2757 Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph

This approach begins with the development of the movement and continues with the use of new materials. This same approach is reflected in Calibre 2757, whose additional split-seconds chronograph plate has been specially designed to ensure efficiency thanks to the in-depth arrangement of its components.

This optimisation of volumes, despite the thinness of the calibre, is also accompanied by new materials. Some of the wheels in the going train have been made of titanium or electroformed in nickel- phosphorus with a toothing profile specific to Vacheron Constantin, the goal being to ensure better gear penetration so as to avoid any jerking of the seconds hand. Silicon, an ultra-light material that requires no lubrication, is also used for one of the split-seconds levers and its insulator.

These savings in component weight and friction thus reduce the loss of energy amplitude from the barrel, thereby maintaining a comfortable power reserve of up to 50 hours with the chronograph activated.

For short-time measurements, a function demanding extreme regularity in terms of precision, Vacheron Constantin watchmakers have opted for a construction with two column wheels: the first devoted to the chronograph and the other to the split-seconds mechanism. This chronograph is thus controlled by a single pusher at 2 o’clock for the basic functions (start/stop/reset) and by the one at 4 o’clock for the split-seconds (stop/reset).

Pressing the latter stops the seconds hand on an intermediate time while the first hand continues running. Pressing it again enables the split-seconds hand to join the first seconds hand in counting off time. Two scales further enhance the technical nature of this timepiece.

The tachymeter scale, screen-printed in white on a 1,000-metre base, enables the average speed in km/h to be calculated over the first minute of timekeeping; the telemeter scale in red is used to calculate distances of up to 20 km according to the speed of sound (340 metres/second).

The chronograph functions are complemented by a minute repeater, activated by the lever on the left-hand side of the case. An essential complication for musical watches, the minute repeater has been part of Vacheron Constantin’s watchmaking vocabulary for more than two centuries, sounding the hours, quarters and minutes on demand.

The first known mention of a Vacheron Constantin chiming watch in the production records dates back to 1806, with a gold quarter-repeater pocket watch. Since that date, chiming and repeater watches have been part of the Maison’s heritage that has continued to grow over the decades.

Calibre 2757 is the direct heir to this tradition, benefiting from the technical developments perfected within the Manufacture. These include an ingenious centripetal flying strike regulator.

In a minute repeater watch, this mechanism regulates the duration of the musical sequence so that the notes can be heard distinctly and harmoniously. This system is distinguished by its two weights whose very special shape has been optimised to act as a brake by means of centripetal force acting on the governor’s rotating shaft, thereby evening out the energy released by the barrel and regulated by the tourbillon. This original device is also perfectly silent. Visible exclusively through the caseback, the tourbillon is distinguished by a carriage whose shape is inspired by the Maison’s Maltese cross emblem. Held by a delicately hand-chamfered bridge, this regulator carriage performs one complete rotation per minute.

Vacheron Constantin Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph

Presented in a 45 mm-diameter 750/1000 5N pink gold case with an exhibition back and on an alligator leather strap with gold folding clasp, this watch represents a technical feat as well as epitomising extraordinary mastery in the field of watchmaking finishing.

A signature feature of Vacheron Constantin watches is that each component is finely decorated with hand-made finishes before being assembled, even when destined to remain hidden. These surfaces that is alternately bevelled, polished, satin-finished, frosted, circular-grained or engraved and beadblasted create a play of light that brings out all the magic of Vacheron Constantin’s calibres and contributes to the brand’s intrinsic anatomy of beauty.

Vacheron Constantin Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph

The assembly, setting into operation and casing-up of this Les Cabinotiers Minute repeater split-seconds monopusher chronograph movement thus represents only one third of the time devoted to the watch, as opposed to two thirds devoted to the calibre finishing.

The contrast between the bridges and maintaining plate with Vacheron Constantin’s signature black coating and the “metallic” moving parts already acts as a revelation of this kinetic art, which takes shape thanks to the meticulous attention lavished on details.

On the dial side, the skeletonised bridges, with their hand-chamfered and straight-grained flanks feature a circular satin finish. The wheels, with their chamfered arms, are burnished and polished, a complex operation that requires special tools for the titanium wheels.

On the caseback side of the movement, the watchmaker in charge of the timepiece – who carries out all the assembly and finishing operations right the way through to timing and casing-up in the manner of 18th century cabinotiers – has created an original decoration, in keeping with this remarkable timepiece.

The blackened bridges featured a hollowed-out surface that has been sandblasted to a very fine grain by hand, topped by a mirror-polished sink. This magnificent execution, which plays on the reflections of light between the matt and the shiny, brings out the “musical” components of the movement. The strike governor is notably engraved with the initials J.M.C. in tribute to Jean-Marc Vacheron and features a bar whose delicate rounding off involves 12 hours of meticulous hand craftsmanship. The Tourbillon Bridge is engraved with Vacheron Constantin’s Maltese cross emblem.

The single-piece watch Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph features a concern for impeccable finishing and meticulous decoration of all watch components, even those that remain invisible, vividly illustrating Vacheron Constantin’s theme for 2022:”The Anatomy of Beauty®”.

Technical details

Model: Vacheron Constantin Les Cabinotiers Minute Repeater Tourbillon Split-Seconds Monopusher Chronograph
Reference: 9750C/000R-002C

Movement
Calibre 2757
Developed and manufactured by Vacheron Constantin
Mechanical, manual-winding
33.30 mm diameter, 10.40 mm thick
Approximately 60 hours of power reserve
2.5Hz (18,000 vibrations/hour)
698 components
59 jewels
Poinçon de Genève

Functions
Off-centred/Offset hours and minutes
Chronograph
Split-seconds chronograph
Small seconds
30-minute counter
Minute repeater
Tourbillon

Case
18K 5N pink gold
45 mm diameter, 16.4 mm thick

Dial
Dark grey dial
Hours, minutes and seconds hands: 18K 5N pink gold, polished
Chronograph and split-seconds chronograph hands: gold-toned aluminium, matt

Strap
Black Mississippiensis alligator leather, hand-stitched, saddle-finish, large square scales
Buckle 18K 5N pink gold folding clasp, Half Maltese cross-shaped

Box
Les Cabinotiers box

Edition
Single-piece edition “Les Cabinotiers”, “Pièce unique”, “AC” hallmark engraved on caseback

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

Vacheron Constantin presents a new Collection Excellence Platine timepiece from its Traditionnelle series. Presented at Watches & Wonders 2021, this new Traditionnelle Split-Seconds Chronograph Ultra-Thin platinum watch is produced in an individually numbered 15-piece limited series.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

Highly appreciated by collectors, the Collection Excellence Platine is exclusively composed of limited editions crafted from 950 platinum: case, bezel, dial, crown and folding clasp are forged in this noble metal, right the way through to the alligator leather strap sewn using woven platinum and silk thread. The other elements of the watch, such as the 18K white gold hands and hour-markers, reflect the same refined universe.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

Within the 42.5 mm-diameter case beats Calibre 3500, a movement launched in 2015 to mark the 260th anniversary of the Manufacture. Comprising 473 elements and beating at a frequency of 21,600 vibrations per hour (3 Hz), it has a 48-hour power reserve.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

Its distinctive design makes this ultra-thin self-winding movement one of the thinnest for this type of complication (5.2 mm), enabling the watch to maintain a modest overall thickness of just 10.72 mm. The creation of an extremely thin non-spherical differential made it possible to retain the power reserve indication without affecting the movement thickness.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

This self-winding movement is also equipped with a 22K gold peripheral oscillating weight, adorned with motifs inspired by the Maltese cross. Mounted on ball bearings, this unusual construction provides a perfectly clear view of Caliber 3500, entirely hand decorated. This peripheral structure also serves to preserve its exceptional slimness.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

This calibre pays tribute to the historic construction of Haute Horlogerie chronographs with its two column-wheels and its lateral clutch mechanism. This classic construction is further enriched by numerous technically advanced features, including the dragging-display 60-minute counter which reduces the loss of amplitude generally observed when the chronograph function is activated. When the chronograph function is stopped, this type of display also provides a more legible indication of the time.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

The use of a split-seconds chronograph is ideal for measuring two different times. When the crown is pressed, the centre sweep-seconds hand and the split-seconds hand began running while remaining superimposed. Activating the push-piece at 2 o’clock makes the split-seconds stop, while the sweep-seconds hand continues running. A first time can thus be memorised.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

Another press on the 2 o’clock push-piece enables the split-seconds hand to catch up with and once again place it itself over the seconds hand. The operation may be repeated as many times as necessary to ensure several successive timings during the same event.

Vacheron Constantin Collection Excellence Platine Traditionnelle Split-Seconds Chronograph Ultra-Thin

Technical details

Model: Traditionnelle split-seconds chronograph ultra-thin
Collection: Excellence Platine
Reference: 5400T/000P-B637

Movement
Calibre 3500
Developed and manufactured by Vacheron Constantin
Mechanical, self-winding
Peripheral rotor in 22K
37.66 mm (16¾’’’) diameter, 5.2 mm thick
Approximately 48 hours of power reserve
3Hz (21,600 vibrations per hour)
473 components
47 jewels
Hallmark of Geneva certified timepiece

Indications
Hours, minutes, small seconds at 9 o’clock
Monopusher split-second chronograph (with 60-minute counter at 3 o’clock)
Tachymetric scale
Power reserve at 6 o’clock

Case
950 platinum
42.5 mm diameter, 10.72 mm thick
Transparent sapphire crystal caseback
Water-resistance tested at a pressure of 3 bar (approx. 30 meters)

Dial
950 platinum, sand-blasted
“Pt950” hallmark between 4 and 5 o’clock
18K white gold applied hour-markers

Strap
Dark blue Mississippiensis alligator leather with alligator leather inner shell, hand-stitched with
950 platinum and silk, saddle-finish, large square scales

Clasp
950 platinum folding clasp
Polished half Maltese cross-shaped

Edition
Limited edition of 15 individually numbered pieces
“N°XX/15” engraved on caseback
Available exclusively from Vacheron Constantin boutiques

Montblanc 1858 Split Second Chronograph Limited Edition 8

Unveiled at the Salón Internacional Alta Relojería (SIAR) in Mexico (15-17 October 2019), the Montblanc 1858 Split Second Chronograph Limited Edition 8 reinterprets a historical Minerva military monopusher chronograph from the 1930s.

The Montblanc 1858 Split Second Chronograph Limited Edition 8 is a true watch for connoisseurs inspired by the heritage of Minerva with a distinctive vintage green aesthetic, reminiscent of the colours of Mexico. The dial is made of green Jade Nephrine, expressing the spirit of mountain exploration.

The Montblanc 1858 product line is inspired by the legendary Minerva professional watches from the 1920s and 1930s which were conceived for military use and exploration. Reinterpreting these legendary models, the Montblanc 1858 watches express the spirit of mountain exploration, embodying the modern trend of returning and reconnecting to nature.

Montblanc 1858 Split Second Chronograph Limited Edition 8

The Montblanc 1858 Split Second Chronograph Limited Edition 8 combines a 44-mm bronze case with a distinctive smoked-green dial crafted from nephrite jade, a first for the Maison. Nephrite jade is one of two distinct mineral forms of this precious stone and is prized for its durability, toughness, translucency and lustre.

Inspired by the Mexican flag, the Nephrite jade green dial is paired with rose-gold-coloured elements and red accents that accentuate the vintage style, while also providing excellent readability of the complications both day and night. An anti-magnetized treatment on the inside of the sapphire crystal allows for greater precision of the two chronograph seconds hands. The chronograph indications are displayed via a rose gold-coated central chronograph second hand, a white-coloured split second hand (to measure a second time interval) and a chronograph minute counter at three o’clock.

Montblanc 1858 Split Second Chronograph with bronze case and Smoked green nephrite jade stone dial

Following the design of the original Minerva timepiece, the Montblanc 1858 Split Second Chronograph Limited Edition 8 features a telemeter scale that runs around the dial, which was a common feature on the legendary Minerva chronographs. A telemeter makes it possible to measure the distance of a phenomenon, which is both visible and audible, like the lightning and thunder in a storm. The chronograph hand starts when the phenomenon is seen (lightning) and is stopped when the sound is heard (thunder). The position on the scale shows the distance in kilometres separating the phenomenon from the observer (or the user from the storm, in this example). Calibration is based on the speed at which sound travels through the air, which is approximately 340 meters per second or 1,115 feet per second.

The timepiece also features a tachymeter (base 1000) at the centre of the dial in a colimaçon, snail shape, which allows the user to measure a length of time up to three minutes (instead of one minute in a traditional tachymeter scale around the dial). The tachymeter scale is to show the speed of a moving object, such as a car, over a known distance, measured in miles or kilometres. As the moving car passes the starting-point of the measured course, the owner starts the chronograph hand and stops it as the car passes the finishing-point. The number indicated by the hand on the tachymeter scale represents the speed in kilometres or miles per hour.

It is combined with a complex “rattrapante” (split second) complication developed by the Montblanc engineers that allows the user to measure intermediate times without interrupting the ongoing measurement of a longer elapsing time. The “rattrapante” can be admired through the sapphire glass of the case back like on a traditional timepiece with such a function.

Montblanc 1858 Split Second Chronograph Limited Edition 8

The Montblanc 1858 Split Second Chronograph Limited Edition 8 is equipped with the hand-crafted Manufacture monopusher chronograph calibre MB M16.31 that features two column wheels, horizontal coupling and a power reserve of 50 hours. The movement takes its inspiration from the original Minerva calibre 17.29, developed in the 1930s, that was used for both pocket watches and wristwatches.

This modern-day version is recognisable thanks to its beautiful hand-finishing such as Côtes de Genève stripes, inner angles, circular graining and bevelling as well as its fine details such as the recognizable Minerva arrow, a chronograph bridge shaped in the form of a “V”, and a large screwed balance that has a traditional frequency of 18,000 semi-oscillations per hour.

The timepiece features a matching green alligator strap with beige stitching that has been hand-crafted by the Richemont Pelletteria in Florence.

In order to guarantee the performance of the product line, the limited-edition timepieces undergo over 500 hours of simulated wear, with specific testing and controls under real-life conditions.

Technical details

Model: Montblanc 1858 Split Second Chronograph Limited Edition 8
Ident. 125603

Movement
Montblanc Manufacture Calibre MB M16.31
Manually wound monopusher chronograph with split second, tachymeter and telemeter
Chronograph Monopusher with two column-wheels (one for the chronograph and one for the split second) and horizontal coupling
Diameter = 38.4 mm; height = 8.13 mm
Number of components: 286
Number of rubies: 25
Power reserve: Approx. 50 hours
Balance: Screw balance, diameter = 14.5 mm; moment of inertia = 59 mgcm²
Frequency: 18,000 A/h (2.5 Hz)
Hairspring: With Phillips terminal curve
Plate: Rhodium-plated German silver with circular graining on both sides
Bridges: Rhodium-plated German silver with “Côtes de Genève”
Going-train: Gold-plated, faceted arms, diamond polished surfaces

Displays
Hours and minutes from the centre
Small seconds at 9 o’clock
Chronograph’s elapsed-second and split-second hand from the dial’s centre
Counter for 30 elapsed minutes at 3 o’clock
Tachymeter and telemeter scales
Habillage

Case
Special alloy of bronze
Diameter = 44 mm; height = 14.55 mm
Crystal: Scratch-resistant, domed sapphire, antireflective crystal, anti-magnetized treatment
Back: Screwed titanium bronze-plated case back with inset pane of sapphire crystal
Water resistance: 3 bar
Crown: Bronze with Montblanc emblem in raised relief
Pushers: Monopusher chronograph integrated into the crown and one pusher at 2 o’clock for the split-second

Dial
Smoked green nephrite jade stone, beige Arabic numerals coated with Super-LumiNova®, 18K rose gold-plated luminescent hour-hand and minute-hands, 18K rose gold-plated chronograph and second hand, red-coloured split-second hand, historical Montblanc emblem at 12 o’clock, tachymeter scale on the central part of the dial and telemeter on the exterior of the dial

Wristband
Green alligator leather with beige stitching

Edition
Limited Edition 8 pieces

Certification
Certified by the Montblanc Laboratory Test 500

Patek Philippe Split-Seconds Chronograph with Perpetual Calendar in Platinum, References 5372P-001 & 5372P-010

Patek Philippe has created a totally new look for its famous split-seconds chronograph in platinum with a perpetual calendar.

Just like the 2015 Split-Seconds Chronograph Ref. 5370 model and the 2016 Ref. 5374, it comes in a round platinum case with a concave bezel as well as countersunk and satin-finished flanks.

Patek Philippe Split-Seconds Chronograph with Perpetual Calendar, Reference 5372P-010

The dial in gold with a blue sunburst pattern or in vertically satin-finished rose gold also presents a subtly reworked appearance. It is a harmonious blend of sophisticated technology, elegance, and readability.

Patek Philippe Split-Seconds Chronograph with Perpetual Calendar Ref. 5372P-010

Both models are equipped with the manual-wound Caliber CHR 27-525 PS Q movement. Both indicate: Month at 3H, Day of the week at 9H, Date at 6H, Leap year at 4.30H, Day/Night display at 7.30H and Moon-phase at 12H. They also offer the split second chronograph function.

Technical details

Model: Patek Philippe Split-Seconds Chronograph with Perpetual Calendar, Reference 5372P

Featured references

  • Ref. 5372P-001: Platinum case, Blue sunburst dial with gold applied numerals, Shiny chocolate brown alligator strap
  • Ref. 5372P-010: Platinum case, Rose gold, vertical satin-finished dial with blackened gold applied numerals, Shiny navy blue alligator strap

Movement
Manually wound mechanical movement
Caliber CHR 27-525 PS Q
Split-Seconds chronograph and perpetual calendar
Moon phases
Height: 7.3 mm
Jewels: 31
Bridges: 12
Parts: 476
Balance: Gyromax®
Vibrations/hour: 21 600 (3 Hz)
Hallmark: Patek Philippe Seal
Power reserve: With the chronograph disengaged: min. 38 hours – max. 48 hours

Functions
Split-seconds mono-pusher chronograph
Perpetual calendar
60-minute counter
Day, Month, leap year and day/night indication in apertures
Date by hand
Moon phases
Seconds subdial

Case
Platinum
Case diameter: 38.3 mm
Water resistant to 30 m

Dial
Blue sunburst with gold applied numerals or rose gold, vertical satin-finished with blackened gold applied numerals
18K gold dial plate

Strap
Alligator strap with square scales, hand-stitched, shiny navy blue or shiny chocolate brown, fold-over clasp

A. Lange & Söhne Grand Complication Watch in Pink Gold with Enamel Dial, Ref. 912.032

German luxury watch manufacture A. Lange & Söhne unveils a limited edition grand complication watch, which is considered as the most complicated and most exclusive timepiece by the revered watch brand based in Saxony.

The Grand Complication features a host of fascinating functions and yet again manifests the ability of the Saxon master watchmakers to conquer ever new peaks with their undisputed ingenuity.

This masterpiece comes with the most elaborate complications which the art of haute horlogerie has to offer: Chiming mechanism with grand and small strike, minute repeater, split-seconds chronograph with minute counter and flying seconds as well as a perpetual calendar with moon-phase display.

A. Lange & Söhne GRAND COMPLICATION watch in pink gold, Ref. 912.032

This Lange grand complication watch in pink gold is available in a limited edition of six pieces only.

Chiming mechanism with grand and small strike, minute repeater

Two carefully hand-wrought gongs produce the seductive tones of the minute repeater and of the hour and quarter-hour strikes. The A. Lange & Söhne Grand Complication watch is endowed with a chiming mechanism that automatically indicates the time in the grand strike (grande sonnerie) or small strike (petite sonnerie) modes.

Every fifteen minutes, when set to grande sonnerie, it first indicates the full hour on the low-pitched gong and then the quarter-hours with a double strike on both gongs. In the petite sonnerie mode, it indicates the elapsed quarter-hours with one, two, or three double strikes on both gongs. At the top of every hour, it strikes the time in hours on the low-pitched gong.

The chiming mechanism is powered by one of a total of three mainspring barrels. They are wound with the crown. Turning the crown clockwise tensions the springs for the going train and the chronograph. The chiming mechanism barrel is wound in the opposite direction.

When the slide in the case flank is actuated, the minute repeater indicates the time on demand with two gongs: The hours sound with low-pitched tones, the quarter-hours with double-tone strikes, and the minutes with high-pitched tones. At 7:52, for instance, the melody consists of seven low tones, three double strikes, and seven high tones.

Monopusher Chronograph with Rattrapante Function & Flying Seconds

The chronograph of the A. Lange & Söhne Grand Complication is a monopusher type (chronographe monopoussoir) with a rattrapante function and flying seconds (seconde foudroyante). This rare supplementary function makes it possible to freeze stopped times to fifths of a second. A blued-steel hand on the lower subsidiary dial performs five jumps to complete each revolution along its five-second scale while the chronograph is running. Thus, the hand precisely emulates the balance frequency of 2.5 Hz.

A gold chronograph hand and a blued-steel rattrapante hand for stopping lap times sweep the main dial from the centre. They begin to run, together with the flying seconds, as soon as the pusher between 1 and 2 o’clock is pressed. After each revolution of the sweep hands, the minute counter hand in the dial at 12 o’clock advances by one interval.

When the pusher between 10 and 11 o’clock is activated, the blued-steel split-seconds hand will stop to indicate the lap time while the gold chronograph hand continues running. When the pusher in the left-hand flank of the case is pressed again, the split-seconds hand instantly catches up and then remains realigned with the chronograph hand.

When the right-hand pusher is actuated, all four chronograph hands will stop. Pushing the button a second time resets them all to zero. Both mechanisms are precisely and reliably controlled in the classic manner via two column wheels – one each for the chronograph and rattrapante functions.

Perpetual Calendar

The perpetual calendar mechanism emulates the Gregorian calendar. Not only does it know how many days each month has in the course of a year, it is also aware of the fact that February has 29 days in leap years. The mechanism first needs to be corrected by one day in the year 2100. This is because of special rule in the Gregorian calendar which stipulates that the leap year is omitted if the year is divisible by 100. The duration of each month is coded into a 48-segment wheel with recesses that are mechanically sampled by the date switching lever. The deeper the sampled recess, the shorter the current month.

Another special feature of the calendar is that it advances all displays, with the exception of the moon phase, at midnight. The calendar indications are positioned at 3, 9 and 12 o’clock. The subdial on the left indicates the date, the upper one the month in the four-year cycle, and the one at right the day of the week. The upper half of the flying seconds dial exposes the blue-enamelled, solid-gold moon disc that precisely tracks the synodic lunation of the earth’s companion.

The A. Lange & Söhne Grand Complication features a multi-part white enamel dial with Arabic numerals, a railway-track minute scale, and the four characteristic, symmetrically arranged subsidiary dials. A suite of time-consuming process steps is needed for each of the five dial elements to assure the flawless appearance of the composite dial. The heart of the exclusive manually wound movement is a balance that beats with a frequency of 18,000 semi-oscillations per hour.

As a tribute to Ferdinand A. Lange, who established Saxony’s watchmaking heritage, the watch incorporates a Glashütte lever escapement based on one of his early inventions. Its lever and escape wheel are made of hardened 18-carat gold. The lever is designed to be in perfect equilibrium.

A slight camber of the covered pallets prevents any adhesion with the escape wheel. The perfect execution of these intricate design features contributes to the enhanced rate accuracy of the watch. The oscillator is paired with a balance spring crafted in-house. When the mainspring is fully wound, it delivers a power reserve of 30 hours.

All parts of the complex manual winding movement are manufactured and lavishly finished by hand to the strictest Lange quality criteria. At several points, Lange’s master watchmakers took the amount of work invested in finissage to unprecedented levels: For example, all chronograph levers are black-polished.

The exclusive collectors’ item in the 50mm diameter 18K pink gold case comes in a limited edition of six watches.

Technical details

Model: A. Lange & Söhne GRAND COMPLICATION, Ref. 912.032

Movement
Lange manufacture calibre L1902, manually wound, crafted to the most exacting Lange quality standards, decorated and assembled by hand; precision-adjusted in five positions; plates and bridges made of untreated German silver; balance cock engraved by hand; chronograph levers black-polished
Jewels: 67
Screwed gold chatons: 7
Escapement: Glashütte lever escapement, lever and escape wheel in 18-carat gold
Oscillator: Shock-resistant screw balance, superior-quality balance spring manufactured in-house, frequency 18,000 semi-oscillations per hour, precision index tail adjustment system with lateral setscrew and whiplash spring

Power reserve when fully wound
-Going train: 30 hours
-Grand strike: 30 hours
-Small strike: 42 hours

Functions
Time display with hours and minutes; chiming mechanism with grand and small strike; minute repeater; split-seconds chronograph with minute counter and flying seconds; perpetual calendar with date, day of week, month in four-year cycle; moon phase

Operating elements
Crown for winding the watch and setting the time; one pusher each for operating the chronograph and the rattrapante mechanism; lever for activating and deactivating the chiming mechanism; lever for selecting small and grand strike; slide for actuating the minute repeater; correction push pieces for advancing the date, day of week, month, and moon phase

Movement dimensions
Diameter: 40.5 millimetres; height: 14.2 millimetres

Case
Case material: Pink gold
Diameter: 50.0 millimetres
Height: 20.3 millimetres
Crystal and caseback: Sapphire crystal (hardness 9)

Dial
Five-part enamel dial
Hands: Pink gold; minute counter, rattrapante hand and flying se-conds hand blued steel

Strap
Hand-stitched crocodile strap, red-brown
Buckle: Lange deployant buckle in pink gold

Image Credit: Lange Uhren GmbH

Patek Philippe Ladies First Split-Seconds Monopusher Chronograph Ref. 7059R

The prestigious Geneva watch maker Patek Philippe has been always keen to handle the growing appetite among the modern women for complex mechanical watches. Traditionally it is the most preferable watch brand when it comes to decorate the delicate wrists of women who love to wear exclusive mechanical watches.

Knowing this fact, the brand has recently come up with new complex mechanical watches for women, not to forget the repeater models for women that company had launched long time before.

While the Chronograph models remain as the most favorite among ladies, there is huge demand of other complications such as moon phase displays, second or multi time zone, annual or perpetual calendars and even minute repeaters.

In 2009, Patek Philippe responded the demand with the “Ladies First Chronograph” Ref. 7071R. This year the brand comes up with a strikingly elegant, and seductively beautiful ladies’ watch : First split-seconds monopusher chronograph Ref. 7059.

Patek Philippe Ref. 7059: The Ladies First Split-seconds Monopusher Chronograph

The ultra-thin Ladies First split-seconds monopusher chronograph Ref. 7059 by Patek Philippe is considered as the world’s thinnest split-seconds chronograph. The new Patek Philippe Ladies First split-seconds chronograph Ref. 7059 contains a mechanical movement that has held the world record in miniaturization for six years.

Patek Philippe Ladies First Split-Seconds Monopusher Chronograph Ref. 7059R

With a height of 5.25 millimeters, the caliber CH R 27-525 PS is the thinnest column-wheel controlled split-seconds chronograph in the world. And with its patented innovations, it is also one of the most advanced chronograph movements of traditional design. Its makers pulled out all the stops to assure superior rate accuracy and reliability despite the compact dimensions of the caliber.

Novel toothing geometries for the chronograph wheels improve power transmission while reducing friction and wear. The friction drive of the minute counter not only reduces the height of the caliber but also offsets the torque differences between the coupled and uncoupled states of the chronograph; this assures that the amplitude of the balance remains constant in every operating mode.

The teeth of the manual winding mechanism also have a new profile. It becomes evident in the smooth responsiveness of the crown felt by the fingertips, a tactile experience referred to by insiders as “velouté Patek” – the Patek Philippe silk feeling. It is a sensual pleasure that perfectly matches the feminine look of the watch.

The case of this rare and exclusive Grand Complication for ladies unites classic design, traditional artistry, and feminine elegance with true panache. The distinctive Officer’s-style case with straight lugs and screwed strap bars reflects the classic-traditional aspects of the new Ladies First Split Seconds Chronograph Ref. 7059.

Its feminine facets are underscored by the soft, romantic glow of 18K rose gold 4N and the fiery passion of the 153 flawless Top Wesselton diamonds (~0.72 ct.) set in its bezel.

Patek Philippe Ladies First Split-Seconds Monopusher Chronograph Ref. 7059R

A close look at the two sparkling rows of precious diamonds raises the question whether the jeweler’s artistry at this extreme level – selection, arrangement, and setting of the stones – should perhaps also be counted as a complication.

Patek Philippe Ladies First Split-Seconds Monopusher Chronograph Ref. 7059R

The matt opalescent dial also tends to distract from the fact that the mechanical movement beneath it belongs to the so-called “domain of the extraordinary”. The applied Breguet numerals and all hands, including the chronograph and split-seconds hands, are crafted from 18K rose gold.

Patek Philippe Ladies First Split-Seconds Monopusher Chronograph Ref. 7059R
The minute, subsidiary seconds, and 60-minute counter scales are transfer-printed in a rose gold hue. They decorate the dial with a delicate expression that forms a fetching contrast to the horological complexity of the timepiece.

The genius that stands behind its functionality becomes evident when simultaneously starting the slender chronograph and split-seconds hands with the monopusher in the comfortably fluted crown, stopping the split-seconds hand with the pusher at 2 o’clock, activating the pusher again to cause the split-seconds hand to catch up with the chronograph hand, and finally resetting both hands to zero. This exquisitely choreographed mechanical ballet instantly wins over a woman’s heart.

Patek Philippe Ladies First Split-Seconds Monopusher Chronograph Ref. 7059R

A sapphire-crystal case back adorned with 76 flawless Top Wesselton diamonds totaling approx. 0.40 ct. showcases the ultimate in watchmaking artistry. The focus is on two column wheels crowned with polished caps, a venerable tradition at Patek Philippe.

They are framed by lavishly decorated bridges with polished chamfers and Geneva striping. The display back also reveals elegantly shaped parts and the striking bridges “à l’ancienne” with reentrant angles that can only be finished by hand, a process that requires exceptional talent and many years of experience.

Movements like this cannot be produced with assembly-line methods. They are crafted individually by the hands of a master watchmaker. Because of this, Patek Philippe can only produce very few pieces of the Ref. 7059 Ladies First split-seconds chronograph per year.

Technical details

Model: Patek Philippe Ladies First Monopusher Split-seconds Chronograph, Ref. 7059 in 18K rose gold (4N)

Movement
– Caliber CHR 27-525 PS
– Ultra-thin manually wound mechanical movement, monopusher splitseconds chronograph with column wheels, chronograph and split-seconds hands, 60-minute counter, and subsidiary seconds
– Diameter 27.30 mm
– Height: 5.25 mm
– Number of parts: 252
– Number of jewels: 27
– Power reserve: 48 hours
– Balance: 2-arm Gyromax with 8 poising weights
– Frequency: 21,600 semi-oscillations per hour (3 Hz)
– Balance spring: Breguet

Functions
Two-position crown
– Pushed in: To wind the watch
– Pulled out: To set the time

Displays
Hours and minutes from the center
Chronograph (trotteuse) and split-seconds hands from the center
Subsidiary dials:
– Subsidiary seconds at 9 o’clock
– Continuously running 60-minute counter at 3 o’clock

Chronograph pushers
Chronograph start, stop, and reset with pusher in the crown
Start and stop of split-seconds hand with pusher at 2 o’clock

Case
– Officer’s-style case in 18K rose gold (4N), cambered sapphire crystal, bezel with 153 flawless Top Wesselton diamonds totaling approx. 0.72 ct., screwed sapphire-crystal display back with 76 flawless Top Wesselton diamonds totaling approx. 0.40 ct.
– Water-resistant to 30 meters
– Case dimensions: Diameter 33.2 mm
– Height: 8.6 mm
– Width between lugs: 21 mm
– Water-resistant to 30 m (3 bar)

Dial
– Matt opalescent, powder rose imprint
– Ten applied Breguet numerals in 18K rose gold
– “Poire Stuart” hour and minute hands in 18K rose gold
– Counterbalanced chronograph and split-seconds hands in 18K rose gold
Subsidiary dials:
– Subsidiary seconds at 9 o’clock: Hands in 18K rose gold
– 60-minute counter at 3 o’clock: Hands in 18K rose gold

Strap
Alligator leather with square scales, hand-stitched, matt mother-of-pearl hue, prong buckle in 18K rose gold with 26 diamonds totaling approx. 0.18 ct.

Patek Philippe Split-seconds Monopusher Chronograph Ref. 5950A

With its new Ref. 5950A split-seconds monopusher chronograph, Patek Philippe yet again presents a concept never before realized in this way: the combination of an individually crafted ultra-thin rattrapante chronograph with a case in stainless steel – a tribute to chrome steel as a case material in its own right.

In haute horlogerie, stainless steel today is just as highly regarded as are platinum and the various hues of gold. This is affirmed by diamond-studded ladies’ watches, by the success of the legendary Nautilus, and by the impressive auction house records established by historic Patek Philippe steel watches from the 1940s.

Patek Philippe Split-seconds Monopusher Chronograph Ref. 5950A

The profound respect with which Patek Philippe watchmakers handle stainless steel is easy to see when looking at a chronograph movement of the Genevan manufacture through a magnifying glass.

Every single steel part of the elaborate calibers is finished with the utmost in craftsmanship. So it stands to reason that a movement with such meticulous finissage lavished on its steel components can legitimately be cased in steel. With the Ref. 5950A (A stands for acier, the French word for steel), Patek Philippe has made a smart decision, as it did long ago with the Nautilus and the Twenty~4®.

Caliber CHR 27-525 PS: the world’s thinnest rattrapante movement

One of the salient features of the new Patek Philippe split-seconds monopusher chronograph is the case, which is thinner than that of many ordinary three-hand watches. This is due to the exquisite CHR 27-525 PS movement with which the manufacture set a new global record in 2005 for the thinnest column-wheel chronograph caliber ever made.

As usual at Patek Philippe, the caliber designation tells a story: CHronograph Rattrapante, 27 mm diameter, 5.25 mm height, seconds subdial (PS stands for petite seconde). A separate department was set up in 2003 explicitly to develop this very first proprietary chronograph movement.

However, its objective was not to break a world record; it was to explore innovative solutions for Patek Philippe’s future chronograph calibers. One of the new facets was the continuously running 60-minute counter which is driven directly by the cannon pinion.

When the chronograph is operating, the minute-counter wheel is powered by the setting wheel that is concentrically and freely mounted on the minute-counter arbor. Power transmission relies on two friction springs between the minute-counter wheel and the arbor of the setting wheel.

Patek Philippe Caliber CHR 27-525 PS

The force exerted by the friction springs on the chronograph-wheel arbor to suppress chronograph hand vibrations is compensated by the elimination of friction between the minute-counter wheel and the setting wheel arbor.

When the chronograph is switched off, the minute-counter wheel is halted by the brake or the return-to-zero hammer, and the arbor of the setting wheel can idle freely between the two friction springs. Thus, the movement design kills two birds with one stone and not only saves height but also provides automatic equalization of the torque differences between the running and stopped states of the chronograph.

The ultra-thin rattrapante movement has another exclusive asset: the patented toothing geometries for the chronograph wheels (driving, clutch, and seconds wheels). Thanks to the patented toothing, the teeth execute a rolling motion while engaged instead of scraping against each other. This reduces wear and optimizes the overall functionality of the chronograph:

– Minimized backlash suppresses chronograph hand vibration and reduces the loss of torque caused by the friction spring in the base movement.
– No hand quiver or rebound caused by the engagement of the clutch wheel with the chronograph wheel when the chronograph is started.
– Minimized risk of tip-to-tip contacts of the teeth.
– No tip-to-flank contact, improved efficiency, reduced friction.

All of these advantages improve the longevity and the long-term reliability of the watch while preserving its value.

Every single CHR 27-525 PS movement is manually crafted in the manufacture’s haute horlogerie ateliers. Each one is composed of components that are individually filed, chamfered, polished, adjusted, and finished. When all the parts are ready, they are assembled in a so-called repassage en blanc procedure, after which all functions are tested.

Subsequently, the entire movement is disassembled again. Once all parts have been meticulously cleaned, they are reassembled, lubricated, and fine-tuned. Thus, using ancestral production methods, Patek Philippe’s watchmakers create horological masterpieces that exceed the expectations of even the most discerning connoisseurs.

Patek Philippe Split-seconds Monopusher Chronograph in Steel

Ordinarily, horological bijoux like this ultra-thin split-seconds monopusher chronograph movement are integrated in precious-metal cases. But Patek Philippe is always good for a surprise, as in 1976 when the manufacture launched its casually elegant Nautilus model with a provocative headline: “One of the world’s most expensive watches is made of steel.”

The Twenty~4® followed in the 1990s with a novel combination of steel and diamonds. And now, the Ref. 5950A rattrapante chronograph is here, with a cushion-shaped case in solid stainless steel that is water-resistant to 30 meters. The sapphire-crystal glass is cushion-shaped as well and slightly cambered, as is the display back. It affords a view of the breathtaking mechanisms that constitute the world’s thinnest split-seconds chronograph with column-wheel control.

The caliber is framed by a satin-finished surround with gold-filled engravings. Owners who are overwhelmed by so much beauty can have the sapphire-crystal case back replaced with the solid metal back that is supplied with the watch.

The steel strongbox is worn on a hand-stitched brown alligator strap with rectangular scales. Its prong buckle in 18K white gold is decorated with a black lacquered engraving.

Patek Philippe Split-seconds Monopusher Chronograph in Steel

The matt silvery sheen of the dial of the Ref. 5950A matches the deep gloss of the polished steel case. The crisp railway track minute scale emphasizes the masculine, technical look of the split-seconds chronograph. The four dial corners between the circular minute scale and the cushion-shaped bezel are decorated with with fine black-lacquered engravings that add a touch of graceful elegance. Short rattrapante hands.

The time of day is indicated with two elegant, blackened leaf-shaped hands in 18K white gold that point at applied Breguet numerals, also in blackened 18K white gold.

The watch has two subdials with intricate circular guilloché patterns: the running seconds are displayed at 9 o’clock, and the continuously running 60-minute counter is positioned at 3 o’clock. Both leaf-shaped subdial hands are made of black oxidized 18K white gold to match the overall personality of the watch.

Patek Philippe’s Ref. 5950A split-seconds monopusher chronograph is a further manifestation of the manufacture’s independence. It has taken the liberty to present a stopwatch that in a fascinating way violates the conventions of haute horlogerie and creates its own market segment.

The Ref. 5950A features a stunningly thin rattrapante movement produced one at a time by the most gifted watchmakers and cased up in stainless steel.

Technical details

Model: Patek Philippe Split-seconds Monopusher Chronograph Ref. 5950A

Movement
– Caliber CHR 27-525 PS
– Ultra-thin manually wound mechanical movement, split-seconds monopusher chronograph with column-wheel control, chronograph hand, 60-minute counter, subsidiary seconds
– Diameter: 27.30 mm
– Height: 5.25 mm
– Number of parts: 252
– Number of jewels: 27
– Power reserve: 48 hours
– Balance: Two-arm Gyromax with eight poising weights
– Frequency: 21,600 semi-oscillations/hour (3 Hz)
– Balance spring: Breguet

Functions
Two-position crown:
– Pushed in: To wind the watch
– Pulled out: To set the time

Displays
– Center hour and minute hands
– Sweep chronograph and rattrapante hands
– Subsidiary dials
– Seconds subdial at 9 o’clock
– Continuously running 60-minute counter at 3 o’clock

Buttons
– Chronograph start, stop, and reset with in-crown push piece
– Rattrapante function with push piece between 1 and 2 o’clock

Case
– Stainless steel, cambered sapphire-crystal glass, interchangeable solid stainless steel and sapphire-crystal snap backs. Satin-finished ring frame with gold-filled engravings in the corners.
– Water-resistant to 30 meters

Case dimensions:
– Width (9 to 3 o’clock): 37 mm
– Length (6 to 12 o’clock): 37 mm
– Length (6 to 12 o’clock incl. lugs): 44.60 mm
– Height: 10.15 mm
– Width between lugs: 21 mm

Dial
-Silvery opaline with black-lacquered corner engravings
-Transfer-printed railway-track minute scale along the periphery
-Ten applied Breguet numerals in 18K white gold, black oxidized
-Leaf-shaped hour and minute hands in 18K white gold, black oxidized
-Arrow-style counterbalanced chronograph and rattrapante hands, black oxidized
-Subsidiary dials with circular guilloché patterns:
-Seconds subdial at 9 o’clock: leaf-shaped hand in 18K white gold, black oxidized
-60-minute counter at 3 o’clock: leaf-shaped hand in 18K white gold, black oxidized

Strap
 Hand-stitched shiny brown alligator strap with rectangular scales, 18-mm prong buckle in 18K white gold with black-lacquered engraving

Patek Philippe Ref. 5951P – Split-Seconds Monopusher Chronograph with Perpetual Calendar with Platinum Case and Black Dial

Legendary Swiss watch brand Patek Philippe presents new complication-Ref. 5951P, the thinnest split-seconds monopusher chronograph ever made with a perpetual calendar.

It is absolutely legitimate to assign Patek Philippe’s split-seconds or rattrapante chronographs to the category of Grand Complications which also includes minute repeaters, tourbillons, and particularly elaborate calendar mechanisms as well as astronomical functions.

The Ref. 5951P, which combines a split-seconds chronograph with a perpetual calendar, will therefore no doubt rank among the most exciting debuts at this year’s Baselworld show. The specifications imposed another challenge: the movement was to be as thin as possible.

Patek Philippe Split-seconds Monopusher Chronograph with Perpetual Calendar, Ref. 5951P

Patek Philippe’s CHR 27-525 PS basic caliber is already the thinnest column-wheel-controlled split-seconds chronograph movement, so it seemed appropriate that the perpetual calendar cadrature should be similarly discreet. The task was compounded by the fact that the movement has a diameter of only 27,3 mm.

Nonetheless, the workshops succeeded in designing a calendar module with a day/night display that indicates the date, day, month, leap year cycle, and moon phase yet measures only 2.05 mm from top to bottom. Together with the basic movement, this adds up to an overall height of just 7.3 mm, making the new Ref. 5951P the thinnest rattrapante chronograph with perpetual calendar ever crafted by Patek Philippe.

The outcome of this innovation is a perpetual calendar with a moon-phase display comprising 148 individual parts in a cadrature with a diameter of just 27,3 mm and a height of 2.05 mm. It controls a moon-phase display and an analog date as well as the day, the month, the day/night indication and the leap-year cycle in apertures.

This module with a perpetual calendar was developed expressly for the CHR 27-525 PS split-seconds chronograph movement launched in 2005 and now joins it in the new caliber CHR 27-525 PS Q. Due to its extreme complexity, this caliber is exclusively hand-crafted one by one.

Among its special features is the 60-minute chronograph counter driven via the cannon pinion, an ingenious construction that contributes significantly to the ultra-thin silhouette of the movement. Of course, the chronograph wheels of the caliber also have Patek Philippe’s patented tooth profiles that improve its efficiency, reduce friction, and boost functional reliability when the chronograph is engaged.

Its Gyromax balance wheel is fitted with a Breguet balance spring that breathes with a frequency of 21,600 semi-oscillations per hour (3 hertz). The chronograph’s start, stop, and reset commands are activated by a single in-crown pusher. Lap times are stopped with a rectangular push piece at 2 o’clock.

Patek Philippe Split-seconds Monopusher Chronograph with Perpetual Calendar Platinum, Ref. 5951P
The design of the dial also proved to be a challenge. In a relatively small area, it delivers no fewer than 12 indications: three hands for standard time in hours, minutes, and seconds, three hands for the splitseconds chronograph functions, plus the day, month, date, leap-year cycle, moon phase, and day/night indication.

Despite the density of information that it provides, the sporty black dial of the Ref. 5951P is quickly and easily readable. The moon-phase display in the gracefully curved aperture at 12 o’clock deviates from the true lunar cycle by only one day in 122 years. Standard time is indicated with leaf-shaped white-gold hands and applied baton-style hour markers. For contrast, short-time measurements are tracked with red hands.

The fine tips of the chronograph and rattrapante hands follow a scale that precisely emulates the contour of the cushion shaped bezel. The subdial for the analog date is positioned at 6 o’clock flanked by round apertures for the day/night indicator and for the leap-year display.

For once, the years are indicated with Arabic rather than Roman numerals, emphasizing the modern, masculine style of this split-seconds chronograph. The days of the week are displayed in an aperture between the date scale and the seconds subdial, whereas the month aperture is symmetrically positioned on the 60-minute counter side.

With such a clear and aesthetic time and calendar data presentation, Patek Philippe demonstrates yet again that it tolerates no compromises, neither in functionality nor in design.

Patek Philippe 5951P
The Ref. 5951P has been endowed with a cushion shaped platinum case to accommodate its ultra-thin movement. It is reminiscent of the famous art-deco watches for which the manufacture received rave reviews in the 1920s and 1930s.

The rectangular rattrapante pusher in the side of the case at 2 o’clock – it is used to stop lap times – was also inspired by historic models. Next to it is the knurled crown which contains the pusher that controls the chronograph. The sapphire crystal glass duplicates the cushion shape of the case, a square form with curved sides.

The sapphire-crystal insert in the snap back has the same contour. It is a show window on a magnificent movement, revealing many hand-finished components, the elaborate rattrapante mechanism, and the rhythmic beat of the Gyromax balance wheel. It is a sight that will never bore the true watch enthusiast even though the ballet repeats itself infinitely.

Technical details

Model: Patek Philippe Split-seconds Monopusher Chronograph with Perpetual Calendar, Ref. 5951P

Movement
Caliber CHR 27-525 PS Q
Manually wound mechanical movement, split-seconds monopusher chronograph with column-wheel control, chronograph and rattrapante hands, 60-minute counter, and seconds subdial. Perpetual calendar with day, month, leap year, and day/night indication in apertures and analog date. Moon phase.
Diameter: 27.30 mm
Height: 7.30 mm
Number of parts: 400
Number of jewels: 27
Power reserve: 48 hours
Balance: 2-arm Gyromax with 8 poising weights
Frequency: 21,600 semi-oscillations/hour (3 Hz)
Balance spring: Breguet

Functions
Two-position crown:
– Pulled out: To set the time
– Pushed in: To wind the watch
Buttons:
– Chronograph start, stop, and reset with in-crown push piece
– Rattrapante start/stop push piece at 2 o’clock

Displays
Center hour and minute hands
Sweep chronograph and rattrapante hands

Apertures:
– Day and day/night indication between 7 and 8 o’clock
– Month in black and leap year in red between 4 and 5 o’clock
– Moon phase at 12 o’clock

Subsidiary dials:
– Seconds at 9 o’clock
– 60-minute counter at 3 o’clock
– Date at 6 o’clock

Corrector push pieces
– Day of week between 8 and 9 o’clock
– Month between 12 and 1 o’clock
– Moon phase between 10 and 11 o’clock
– Date at 12 o’clock

Delivered with correction stylus in ebony with 18K white-gold inlays

Case
950 platinum, cambered sapphire-crystal glass, interchangeable solid platinum and display backs
Water-resistant to 30 meters
Case dimensions: Width (9 to 3 o’clock): 37 mm
Length (6 to 12 o’clock): 37 mm
Length (12 to 6 o’clock, between lugs): 45 mm
Height: 12.35 mm
Width between lugs: 21 mm

Dial
Black
Transfer-printed railway track minute scale along entire periphery
12 applied baton-style hour markers in 18K white gold
Leaf-shaped hour and minute hands in 18K white gold
Arrow-style counterbalanced sweep chronograph and rattrapante hands, painted red
Subdials rhodiumed, with circular guilloché patterns:
– Seconds subdial at 9 o’clock: leaf-shaped seconds hand in 18K white gold, painted black
– 60-minute counter at 3 o’clock: leaf-shaped minute-counter hand in 18K white gold, painted red
Date at 6 o’clock on two-tone dial, rhodiumed on the outside ring and black in the center: leaf-shaped hand in 18K white gold, painted white

Strap
Hand-stitched alligator with large rectangular scales, matt black with red stitching, platinum prong buckle