Greubel Forsey GMT in Platinum Case with Pink Gold PVD Treated Movement

Introduced in 2015, this GMT edition from Greubel Forsey presents a striking contrast between the rich rosé tone of the 5N finish of its main plate and bridges and its case in 950 platinum, which has a slightly lighter shade than the white gold version. This play of colours is repeated through the display back and highlights the universal hours represented by 24 major cities, each one located in a different time zone. The ultimate refinement is both practical and aesthetic: the lighter sectors identify those cities that apply both summer and winter time regimes. To ensure the exclusivity of this Timepiece, production is strictly limited to 22 pieces.

Technical details
Model: GMT
Unique Edition
22 pieces in platinum, pink gold PVD treatment movement
Mechanical hand-wound movement with patented tourbillon Calibre GF05
2nd time zone GMT display • Tourbillon 24 Secondes • titanium rotating globe with universal time display • 24 time zone worldtime display • summer time indicator • worldtime disc with summer time zones • day-and-night indicator • power-reserve indicator • hour and minute display • small second indicator • GMT pusher • equatorial synthetic sapphire crystal lateral window

Movement
Diameter: 36.40 mm
Thickness: 9.80 mm

Number of parts
• Complete movement: 437 parts
• Tourbillon cage: 86 parts
• Weight of the cage: 0.39 g
Number of jewels: 50; Olived-domed jewels in gold chatons

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: 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, pink gold PVD treatment

Bridges
• Nickel silver, frosted and spotted, with polished bevelling and countersinks, straight-grained flanks, pink gold PVD treatment
• Gold plate engraved with the individual number
• Flat black polished steel tourbillon bridge, hand-bevelled

Tourbillon cage
• Inclined at a 25° angle, 24-second rotation
• Cage pillars in Avional
• Titanium cage bridges
• Gold counterweight

Gearing
• Involute circle profile
• Conical gearing with corrected profiles

Displays
Hour and minute
Small second
72-hour power reserve on a sector
2nd time zone GMT indicator
24 time zone worldtime display
Rotating titanium globe with universal time display
Summer time indicator
Day-and-night indicator

Case
Platinum 950 with asymmetrical convex synthetic sapphire crystal
Diameter: 43.50 mm
Thickness: 16.14 mm
Transparent back with asymmetrical convex synthetic sapphire crystal
Polished bezel and centre band with hand-finished straight graining
Lateral window with shaped synthetic sapphire crystal
Three-dimensional, variable geometry-shaped lugs
Platinum 950 pusher with raised polished engraving “GMT” on a hand-punched background
Raised polished engraving “Greubel Forsey” on a hand-punched background
Hand-engraved individual number
Gold security screws
Water-resistant: 3 atm – 30 m – 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: In platinum with engraved and black lacquered GF logo

Dial
Principal hour-minute dial: in gold, frosted, black treatment, Hour-ring in gold, black treatment
Gold power-reserve sector
Gold small second dial
Gold GMT indicator
Applied gold Greubel Forsey logo

Hands
Hour and minute in polished gold, with Super-LumiNova
Small second and power-reserve in blued steel
2nd time zone GMT indicator, red triangle

Strap and clasp
Hand-sewn blue or black alligator
Platinum 950 folding clasp, hand-engraved with the Greubel Forsey logo

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