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Greubel Forsey Double Tourbillon Technique

Double Tourbillon Technique
Mechanical hand-wound movement, Calibre GF 02s
Double Tourbillon 30°,

Hours and minutes display, Outer Tourbillon 4-minute rotation indicator,

Inner Tourbillon 60 Second rotation indicator, power-reserve indicator.

Patented Movement
Movement dimensions   
• Diameter : 38.40 mm
• Thickness : 12.15 mm

Number of parts    

• Complete movement : 385 parts
• 2 Tourbillon cages?:    128 parts
• Weight of the two cages :  1.17 g

Number of jewels   
• 43
• Olive-domed jewels in gold chatons

Power reserve   
120 hours

Barrels   
• Four coaxial series-coupled fast-rotating barrels (1 turn in 3.2 hours),

equipped with a slipping spring to avoid excess tension
• Gold nickel-palladium finished cover with relief engraving

Balance wheel   
Variable-inertia with white gold mean-time screws (10.70 mm diameter)

Frequency   
21,600 vibrations/hour

Balance spring   
• Phillips terminal curve
• Geneva-style stud

Main Plates   
Frosted nickel silver, polished bevelling, black chromed finish

Bridges   
Frosted nickel silver, polished bevelling, nickel-palladium finish,

gold nameplate bearing the watch number

Gearing   
• Involute circle profile
• Conical gearing with corrected profile

Inner Tourbillon   
Inclined at a 30° angle, 1 rotation per minute

Outer Tourbillon   
• 1 rotation in 4 minutes
• Hand-bevelled and openworked cage pillars
• Solid gold counterweight

Displays   
• Hours and minutes
• Small seconds
• 4-minute Outer Tourbillon rotation indicator
• 120-hour power reserve on a sector

Exterior
Case material and finishes   
• In 5N red gold, white gold or platinum with convex sapphire crystal
• Transparent back with convex sapphire crystal
• Raised polished engraving of the name of the Invention on a hand-punched

background
• Gold security screws
• Nameplates with text screwed to the sides
• Three-dimensional lugs secured with screws
• Hand-engraved individual number

Case dimensions   
• Diameter : 47.50 mm
• Thickness : 16.84 mm

Water resistance of the case   
3 ATM - 30 M - 100 FT

Crown   
Gold with engraved and black lacquered GF logo

Dial   
• Sapphire hour markers
• Small seconds and power-reserve indicators in gold

Hands    
• Hours and minutes in gold
• Small seconds, Power reserve (red triangles)
• Sapphire 4-minute indicator

Strap   
Hand-sewn black, brown, dark blue,

grey or burgundy alligator leather with gold folding clasp,

engraved with the Greubel Forsey logo