GREUBEL FORSEY - Invention Piece 3
GREUBEL FORSEY - Invention Piece 3

Press kits

Invention Piece 3

Tourbillon 24 Secondes Incliné, hours and minutes display, Seconds display and power-reserve indicator. Unique series of 33 pieces...


Movement dimensions 
• Diameter : 36.40 mm
• Thickness : 11.51 mm

Number of parts 
• Complete movement : 370 parts
• Tourbillon cage : 87 parts
• Weight of the cage : 0.39 g

Number of jewels 
• 42
• Olive-domed jewels in gold chatons

Power reserve 72 hours

Barrels Rapid rotating twin barrels (1 turn in 3.2 hours) equipped with a slipping spring to avoid excessive tension

Balance wheel Variable-inertia 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 Bridges 
• Nickel silver
• “Message from the Inventor Watchmakers” relief engraved on gold plates Gearing 
• Involute circle profile
• Tangential inclined gear with profiled teeth, on fixed wheel and escape wheel pinion 

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

• 24 hours
• Minutes
• Small seconds
• 72-hour power reserve on a sector


• In 5N red gold, white gold or platinum with asymmetrical convex sapphire crystal, 11 watches each
• Transparent back with asymmetrical convex sapphire crystal
• Lateral window with shaped sapphire crystal
• Raised polished engraving of the name of the Invention on a hand-punched background
• Gold security screws
• Polished bezel and centre band with hand-finished straight graining
• Hand-engraved individual number

Case dimensions 
• Diameter : 43.50 mm
• Thickness : 16.06 mm

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

Crown Gold with engraved and black lacquered GF logo

• Hours (red triangle) and minutes (blue triangle)
• Small seconds in flame-blued polished steel
• Power reserve (red triangle)

Strap Hand-sewn black and brown alligator leather with gold folding clasp, engraved with the Greubel Forsey logo