Greubel Forsey Invention Piece 3

Invention Piece 3 is a tribute to the third Greubel Forsey invention, the Tourbillon 24 Secondes, which consists of a single tourbillon cage inclined at a 25° angle and performing a rapid rotation in 24 seconds.

Greubel Forsey Invention Piece 3 Red Gold

This stunning timepiece is powered by a mechanical hand-wound movement, Calibre GF 01N. Equipped with rapid rotating twin barrels, this calibre offers an autonomy of 72 hours.

Greubel Forsey Invention Piece 3 Red Gold
Greubel Forsey Invention Piece 3 Red Gold

Main features of this timepiece include Tourbillon 24 Secondes Incliné mechanism, hours and minutes display, seconds display and power-reserve indicator. The four gold plates are engraved with a portion of a personal message from Robert Greubel and Stephen Forsey.

Greubel Forsey Invention Piece 3 White Gold
Greubel Forsey Invention Piece 3 White Gold

The Tourbillon 24 Secondes uses a fast rotation speed and inclined angle to solve the problem of critical positions of the oscillator in relation to gravity. The 25° angle and the rapid rotation of the tourbillon cage significantly improve the chronometric performance of a system containing only one tourbillon, especially in stable positions.

Greubel Forsey Invention Piece 3

The 43.50 mm diameter case in 18K gold or platinum is fitted with asymmetrical convex sapphire crystals on the front and rear sides.

Greubel Forsey Invention Piece 3

The watch also features a lateral sapphire crystal window on the left side of the case, offering the glimpses of the movement.

Greubel Forsey Invention Piece 3 Platinum
Greubel Forsey Invention Piece 3 Platinum

The GREUBEL FORSEY Invention Piece 3 is available in a unique series of 33 timepieces: 11 each in 5N red gold, white gold or platinum.

Technical details

Model: Greubel Forsey Invention Piece 3

Movement
Mechanical hand-wound movement, Calibre GF 01n
Diameter: 36.40 mm; Thickness: 11.51 mm
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

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

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 FT
Crown: 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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