Introduced in 2016 after six years of R&D, the Signature 1 timepiece by Greubel Forsey combines simplicity and extreme sophistication. For each Signature creation, one talented watchmaker elaborates his or her Timepiece within Greubel Forsey’s universe. Drawing on the resources such as components, the watchmaker operates following Greubel Forsey’s philosophy, and benefit from the skills and expertise specific to the watchmaking Atelier. This framework guarantees Greubel Forsey’s characteristic standards of excellence, both in terms of technical craftsmanship and aesthetics.
While creating the timepiece, the watchmaker expresses him or herself within this structure, while enjoying a considerable amount of freedom, particularly regarding technical, architectural and decorative aspects of the Timepiece. This watchmaker will co-sign the creation with Robert Greubel and Stephen Forsey.
11 pieces in white gold, 11 pieces in 5N red gold,
11 pieces in platinum and 33 pieces in steel
Hand-wound Calibre GFS1 movement
Greubel Forsey timepiece with 3 hands (hour, minute and small second) co-created with Didier J. G. Cretin • GREUBEL FORSEY balance wheel system
Diameter: 34.40 mm
Thickness: 7.40 mm
Number of parts
• Complete movement: 190 parts
• Escapement platform: 61 parts
Number of jewels: 21; Olived-domed jewels in gold chatons
Power reserve: 54 hours
• Barrel equipped with a fixed mainspring-bridle Winding system with sliding click
• Black polished click incorporated into the barrel bridge
• Snailed click wheel and ratchet, polished and bevelled ratchet teeth
Balance: In-house variable-inertia with 6 gold mean-time screws (12.60 mm diameter)
Frequency: 18’000 vibrations/hour
Balance spring: Phillips terminal curve; Geneva-style stud
Main plates: Nickel silver, frosted and spotted, with straight-grained flanks, polished bevelling and countersinks, large polished inclined facets, black PVD treatment
• Nickel silver, Côtes de Genève, frosted and spotted, with straight-grained flanks, polished bevelling and countersinks, large polished inclined facets, nickel-palladium treatment
• Circular-grained steel barrel bridge, hand-polished bevelling and countersinks
• Gold plate engraved with the individual number
• Straight graining steel escapement platform, hand-polished bevelling and countersinks
• Polished steel pillars
• Flat black polished steel balance wheel bridge, hand-polished bevelling and countersinks
Gearing: Involute circle profile
Hours and minutes
In 18k gold, platinum 950 or steel with convex synthetic sapphire crystal
Diameter: 41.40 mm
Thickness: 11.70 mm
Transparent back with synthetic sapphire crystal
Raised engraving “Signature 1” and “Greubel Forsey”
Gold security screws
Polished and straight-grained bezel
Polished and straight-grained caseband
Hand-engraved individual number (for the 18k gold and platinum 950 versions)
Water-resistant: 3 atm - 30 m - 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In 18k gold, platinum 950 or steel with engraved and black lacquered GF logo
18k gold and steel versions: white silvered gold, GREUBEL FORSEY, hours and minutes in black, diamond finished bevel
Platinum 950 version: black-anthracite gold dial, GREUBEL FORSEY, hours and minutes in white, diamond finished bevel
Small second in white silvered gold, diamond finished bevel
18k gold and steel versions: hour and minute hands in polished blued steel, hand-polished countersinks
Platinum 950 version: hour and minute hands in polished gold, hand-polished countersinks
Small second in polished blued steel, hand-polished countersink
Strap and claspHand-sewn, alligator and leather
18k gold, platinum 950 or steel pin buckle, hand-engraved Greubel Forsey logo (for the 18k gold and platinum 950 versions)
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