Launched in 2015, the GMT Black is a unique edition of 22 pieces of its GMT timepiece in titanium treated with black ADLC.
22 pieces in black ADLC titanium
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
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
• Phillips terminal curve
• Geneva-style stud
Main plates: Nickel silver, frosted and spotted, bevelled with countersinks and straight-grained flanks, black chrome treatment
• Nickel silver, frosted and spotted, bevelled with countersinks and straight-grained flanks, black chrome treatment
• Gold plate engraved with the individual number
• Flat black polished steel tourbillon bridge, hand-bevelled
• Inclined at a 25° angle, 24-second rotation
• Cage pillars in Avional
• Titanium cage bridges
• Gold counterweight
• Involute circle profile
• Conical gearing with corrected profiles
Hour and minute
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
In black ADLC titanium with 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
Black ADLC titanium pusher with raised polished engraving “GMT” on a hand-punched background
Raised polished engraving “Greubel Forsey” on a hand-punched background
Engraved individual number on the caseback
Gold security screws
Water-resistant: 3 atm - 30 m - 100 ft (standard NIHS 92-20/SN ISO 22810:2010)
Crown: Black ADLC titanium with engraved GF logo
DialPrincipal 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
Hour and minute in polished gold, with Super-LumiNova
Small second in polished gold and power-reserve in polished gold
2nd time zone GMT indicator, red triangle
Strap and clasp
Hand-sewn black rubber strap
Black ADLC titanium folding clasp, engraved with the Greubel Forsey logo
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