2012/11/21 - FLASHBACK - Greubel Forsey’s Invention Piece 2

Best Complicated Watch Prize


Greubel Forsey’s Invention Piece 2 was awarded the prize for Best Complicated Watch during the 12th Grand Prix d’Horlogerie de Genève on Thursday 15th November. The prize is awarded to the best watch in the Complicated category.

Stephen Forsey, who received the award on behalf of Greubel Forsey, said: “We are very honoured to be awarded this prize for Invention Piece 2. This timepiece pays homage to our second Fundamental Invention, the Quadruple Tourbillon. Its ‘open heart’ architecture reveals the intricate beauty of its complex mechanism and refined hand-finishing.

This prize is independent recognition of Greubel Forsey’s constant quest to improve timekeeping performance and pursuit of excellence in horological art.”

Launched at the 2011 SIHH, Invention Piece 2 is Greubel Forsey’s third prize-winning timepiece at the Grand Prix d’Horlogerie following the award of the 2010 L’Aiguille d’Or for the Double Tourbillon 30° Édition Historique and the award of the 2009 Best Complicated Watch prize for the Double Tourbillon 30° Technique.






Technical Specifications

Invention piece 2
unique 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

• Rapid rotating triple barrels (1 turn in 3.2 hours)
• equipped with a slipping spring to avoid excess tension

Balance wheel : Free sprung balance 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 : Nickel silver, spotted nickel-palladium fi nish, hand bevelled, straight-grained fl anks, polished counter-sinks

• Nickel silver bridge, frosted, spotted with polished bevelling, nickel-palladium fi nish
• Gold nameplate bearing the individual number of the timepiece
• 4 steel Double Tourbillon bridges hand-bevelled,fl at black polished with polished counter-sinks

• Involute circle profi le
• Conical gearing with corrected profi les

Inner Tourbillon : Inclined 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

• 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 o’clock


• 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-fi nished straight graining
• Hand-engraved individual number
• Raised engraving of the name of the Inventors on a hand-punched background

Case dimensions
• Diameter: 43.50 mm
• Thickness: 16.28 mm

Water resistance of the case : 3 atm - 30 m - 100 ft

Crown : Platinum or 5N red gold with engraved and black lacquered GF logo

• 22k gold hour indicators with red triangle
• 22k gold Greubel Forsey initials in centre

• Minute-indicator: rotating disc with fixed blue triangle
• Small second in fl ame-blued polished steel
• Power-reserve in fl ame-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