Greubel Forsey Tourbillon 24 Secondes Vision in White Gold

Introduced in 2015, the Tourbillon 24 Secondes Vision in white gold is a unique edition of 22 timepieces. The primary intention was to present Tourbillon 24 Secondes, the third invention from Greubel Forsey, in a case that is as slender as possible and yet able to accommodate the inclined Tourbillon cage.

By incorporating a dome into the sapphire crystal on the back of the Timepiece, watchmakers at Greubel Forsey have created enough extra volume to allow the tourbillon cage to overlap the reference surface of the rear bridges. The dome is a new and intriguing element that directs attention to the lower bridge of the Tourbillon.

This bridge is more than just a supporting element, it is a triumph of technology and craftsmanship. Its geometry is similar to a Roman vault and its surface is gently polished by hand. Obtaining a perfectly straight reflection over the whole piece requires such expertise and experience that each bridge finished in this way is signed by the craftsman-decorator who executed it.

Apart from the exceptional standard of decoration that naturally applies to all 288 parts in the movement, the play of colours and finishes creates a spectacular visual dynamic, with pride of place given to the sectorial 72-hour power-reserve indicator.

This new creation is also distinguished by its elegant, neoclassical simplicity. The overall aesthetic is extremely refined, paying homage to the standard of creation and the finesse of each component. Particular care has been given to the design of the hands that indicate the time immediately and precisely. They have been lightened to the maximum degree and their form, in the shape of a lance, leads the eye straight to the indications that are first engraved and then “oven-firing” enamelled into the solid gold of the dial.

The fast-rotating Tourbillon 24 Secondes is also an integral part of the graphic composition of the entire piece. Set inside a light well, it creates an animated scene that is an irresistible invitation to explore the back of the timepiece.

Technical details

Model: Tourbillon 24 Secondes Vision
Unique edition, 22 pieces in white gold

Movement

Mechanical hand-wound movement with patented tourbillon Calibre GF01r
Tourbillon 24 Secondes • hour and minute display • small second display • power-reserve indicator

Movement
Diameter: 36.40 mm
Thickness: 7.09 mm
Number of parts
• Complete movement: 293 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.38 g
Number of jewels: 41; Olived-domed jewels in gold chatons

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: Free sprung variable-inertia balance 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 cage
• Inclined at a 25° angle, 24-second rotation
• Cage pillars in Avional
• Titanium cage bridges
• Gold counterweight

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

Displays
Hour and minute
Small second
72-hour power reserve on a sector

Exterior

Case
In 18 k white gold with convex synthetic sapphire crystal
Diameter: 43.50 mm
Thickness: case 13.65mm (complete height on sapphire dome 16.025mm)
Transparent back with 2 convex synthetic sapphire crystals
Three-dimensional, variable geometry-shaped lugs
Raised polished engraving “Tourbillon 24 Secondes Incliné” on a hand-punched background
Gold security screws
Polished bezel and centre band with hand-finished straight graining
Hand-engraved individual number
Water-resistant: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In 18k white gold with engraved and black lacquered GF logo

Dial
Gold dial, silvered colour with engraved and “oven fired» enamelled indexes
Gold display sectors
Applied gold Greubel Forsey logo
Hands: Hour and minute, small second and power-reserve in polished blued steel

Strap and buckle
Hand-sewn black alligator
18 k white gold tang buckle, hand-engraved with the Greubel Forsey logo

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