Greubel Forsey – Quadruple Tourbillon Invention Piece 2 (SIHH 2011)

Unique edition of 11 pieces in platinum and 11 pieces in 5n red gold.

Movement – Mechanical hand-wound movement. Calibre GF03n.

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.

Barrels – 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 flanks, polished counter-sinks.

Bridges – Nickel silver bridge, frosted, spotted with polished bevelling, nickel-palladium finish. Gold nameplate bearing the individual number of the timepiece. 4 steel Double Tourbillon bridges hand-bevelled, flat black polished with polished counter-sinks.

Gearing – Involute circle profile. Conical gearing with corrected profiles.

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.

Displays – 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.

Exterior

Case – 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. Unique edition of 11 pieces in platinum and 11 pieces in 5N red gold.

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.

Dial – 22k gold hour indicators with red triangle. 22k gold Greubel Forsey initials in centre.

Hands – Minute-indicator: rotating disc with fixed blue triangle. Small second in flame-blued polished steel. Power-reserve in flame-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.

Source: Greubel Forsey

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