GREUBEL FORSEY Invention Piece 3

Invention Piece 3 by Swiss luxury watch maker GREUBEL FORSEY has made in a unique series of 33 timepieces. This stunning timekeeping marvel is powered with a Mechanical hand-wound movement, Calibre GF 01N.

Main features include Tourbillon 24 Secondes Incliné, hours and minutes display, Seconds display and power-reserve indicator. Edition is limited to 11 watches each in 5N red gold, white gold or platinum.

Technical details
Movement
Mechanical hand-wound movement, Calibre GF 01n
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

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

Case
In 5N red gold, white gold or platinum with asymmetrical convex sapphire crystal, 11 watches each
Diameter : 43.50 mm
Thickness : 16.06 mm
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
Water resistance of the case 3 ATM – 30 M – 100 FTCrown Gold with engraved and black lacquered GF logo

Hands
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

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