Thursday, February 4, 2016

GREUBEL FORSEY – DOUBLE BALANCIER a Differentiel Constant White Gold Unique Edition


















GREUBEL FORSEY DOUBLE BALANCIER 35° à Différentiel Constant White Gold Unique Edition NEW

Greubel Forsey exclusively presents the first Double Balancier à Différentiel Constant – the result of painstaking years of research – at the Salon International de la Haute Horlogerie 2016 (SIHH).

Redefining the limits of Chronometry

This new mechanism pushes the limits of timekeeping. Two inclined balance wheels optimise performance in stable positions, while the Differentiel Spherique Constant provides more steady amplitude.

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“Augmented” architecture

Aesthetically, this Timepiece is both understated and yet complex. The eye-catching wide aperture with powerful three-dimensional aspects, extensively reveals the heart of the mechanism. We dive into an architectural world built on many levels, a miniature futuristic city constructed between the balance wheels whose inclination is almost dizzying

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The result of long-term research

Robert Greubel and Stephen Forsey began to research multiple regulators in 1999 as part of their
EWT (Experimental Watch Technology) platform. The first prototype to feature a fixed oscillator, the Double Balancier Incliné, was presented at Baselworld in 2009, as the sixth Greubel Forsey invention.

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The two inclined balance wheels – initially positioned one above the other – now occupy distinct and separate three-dimensional spaces. This new configuration is responsible for improved chronometric performance, while the Differentiel Spherique Constant cuts the margin of error in half.

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Excellent craftsmanship

Once again, this Timepiece stands out by virtue of the extreme attention paid to its finishing. These include the three-dimensional, geometric lugs and the raised, polished engraving on a hand-punched background.

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This unique edition is comprised of 33 pieces in white gold, which will be followed by other, non-limited versions.

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Technical Specifications

Collection: Double Balancier 30° / Unique Edition to 33 exemplaires
 Unique edition (for white gold version) 33 pieces in white gold

GF04

Hand-wound patented Calibre GF04 movement • Patents pending
Two balance wheels inclined at a 30° angle • hour and minute display • small second display •
4-minute constant differential rotation indicator • power-reserve indicator


Movement
Movement dimensions
• Diameter : 36.40 mm
• Thickness : 8.15 mm
Number of parts
• Complete movement : 285 parts
• Escapement platforms : 2 x 71 parts
• 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 straight-grained flanks,
polished bevelling and counter-sinks, grey PVD treatment
Bridges
• Nickel silver, spotted, with straight-grained flanks, polished bevelling and countersinks, grey PVD treatment
• Flat black polished steel differential bridges
• Flat black polished gold centre bridge, with straight-grained flanks, polished bevelling and countersinks
• 2 engraved gold plates
(1 x Greubel Forsey, 1 x individual number)
Escapement platforms
• Inclined at a 30° angle
• Nickel silver, straight graining, hand-polished bevelling and countersinks, nickel-palladium
treatment
• Polished steel pillars
• Flat black polished and barrel polished
steel balance bridges
Gearing
• Involute circle profile
• Inclined gear with profiled teeth on fourth wheel
Displays
• Hours and minutes
• Small seconds
• 4-minute differential rotation
• 72-hour power reserve on a sector
Exterior
Case
• In white gold with convex synthetic sapphire crystal
• Transparent back with synthetic sapphire crystal
• Three-dimensional, variable geometry-shaped lugs
• Raised polished engraving “Double 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 : 43.00 mm
• Thickness : 13.38 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, silvered with engraved and “oven fired” enamelled indexes
(émail grand feu champlevé)
• Differential rotation and small second indicators in gold
Hands
• Hour and minute in polished gold, with Super-LumiNova
• Small second, 4-minute and power-reserve in polished blued steel
Strap and clasp
• Hand-sewn alligator
• White gold folding clasp, hand-engraved with the Greubel Forsey logo

Year: 2016

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Press release
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For further information: 
Communication Department 
press@greubelforsey.com – +41 79 194 2884
Eplatures-Grise -16 P.O. Box 670 2301
La Chaux-de-Fonds- Switzerland
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www.GreubelForsey.com

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