The two double tourbillons systems are presented head to tail and coupled by a spherical differential. A sub-dial at 5 o'clock conceals triple mainspring barrels and features a red triangle indicating hours and a rotating disk indicates minutes. Small seconds dial at 10 oclock and 56-hour power reserve indicator at 11 oclock compete the dial.
A unique edition of 11 pieces in platinum and 11 in red gold.
Invention piece 2Unique edition of 11 pieces in platinum and 11 pieces in 5n red gold. mechanical hand-wound movement, Calibre GF03n
Quadruple Tourbillon hour and minute display small second indicator power-reserve indicator.
Movement with patented tourbillon
Movement dimensions Diameter: 37.0 mm
Cage diameter: 36.40 mm
Thickness : 11.87 mm
Number of parts Complete movement: 594 composants
1 double tourbillon cage: 129 composants
Weight of one double cage: 1.17 g
Number of jewels 64
Olived-domed jewels in gold chatons
Power reserve: 56 hours
Barrels Rapid rotating triple barrels (1 turn in 3.2 hours)
equipped with a slipping spring to avoid excess tension
Balance wheelFree sprung balance with white gold mean-time screws (10.70 mm diameter)
Frequency: 21600 vibrations/hour
Balance spring Phillips terminal curve
Geneva-style stud
Main PlatesNickel silver, spotted nickel-palladium fi nish, hand bevelled, straight-grained fl anks, polished counter-sinks
Bridges Nickel silver bridge, frosted, spotted with polished bevelling, nickel-palladium finish
Gold nameplate bearing the individual number of the timepiece
4 steel Double Tourbillon bridges hand-bevelled, flat black polished with polished counter-sinks
Gearing Involute circle profile
Conical gearing with corrected profiles
Inner TourbillonInclined at a 30°angle, 1 rotation per minute
Outer Tourbillon 1 rotation in 4 minutes
Hand-bevelled and openworked cage pillars
1 gold Greubel Forsey counterweight per cage
Displays Hours and minutes
Small seconds sub dial (mean performance)
56-hour power reserve on a sector
Tourbillon rotation sapphire crystal indicator (outer cage) in 4 minutes at 1 oclock
Exterior
Case Platinum 950 or 18k 5N red gold with asymmetrical convex sapphire crystal
Transparent back with asymmetrical convex sapphire crystal
Lateral window with shaped sapphire crystal
Gold security screws
Polished bezel and centre band with hand-finished straight graining
Hand-engraved individual number
Raised engraving of the name of the Inventors on a hand-punched background
Unique edition of 11 pieces in platinum and 11 pieces in 5N red gold
Case dimensions Diameter: 43.50 mm
Thickness: 16.28 mm
Water resistance of the case: 3 atm - 30 m - 100 ft
CrownPlatinum or 5N red gold with engraved and black lacquered GF logo
Dial 22k gold hour indicators with red triangle
22k gold Greubel Forsey initials in centre
Hands Minute-indicator: rotating disc with fixed blue triangle
Small second in flame-blued polished steel
Power-reserve in flame-blued polished steel
Sapphire crystal 4-minute indicator
Strap and clasp Hand-sewn black alligator
Platinum 950 or 18k 5N red gold folding clasp, hand-engraved with the Greubel Forsey logo
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