AnthonyTsai
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Greubel Forsey new version of the Quadruple Tourbillon - Baselworld 2009 preview
Press Release
Quadruple Tourbillon à Différentiel Sphérique
Quadruple Tourbillon à Différentiel Sphérique
Mechanical hand-wound movement, Calibre GF03
Quadruple Tourbillon, seconds indicator and power-reserve indicator
Patented movement
Movement dimensions
Diameter: 36.4 mm
Thickness: 9.70 mm
Number of parts
Complete movement: 531 parts
2 double Tourbillon cages: 128 parts each
Weight of each double cage: 1.17 g
Spherical differential: 28 parts
Number of jewels
63
Olived-domed jewels in gold chatons
Power reserve
50 hours
Barrels
Rapid rotating twin barrels (1 Turn in 3.2 hours) one of which is equipped with a slipping spring to avoid excess tension
Balance wheel
Free sprung balance with white gold mean-time screws (10.7 mm diameter)
Frequency
21'600 vibrations/hour
Balance spring
Phillips terminal curve
Geneva-style stud
Main Plates
Nickel silver, spotted nickel palladium-finish, hand bevelled, straight-grained flanks, polished counter-sinks
Bridges
Barrel bridge:nickel silver, hand bevelled and frosted, nickel palladium-finish, "Greubel Forsey" gold plate with the individual number of the timepiece
Two steel Tourbillon bridges (movement side): hand-bevelled, flat black polished with polished counter-sinks
Two sapphire Tourbillon bridges (dial side)
Gearing
Involute circle profile
Conical gearing with corrected profile
Inner Tourbillon
Inclined at a 30°angle, 1 rotation per minute
Outer Tourbillon
1 rotation in 4 minutes
Hand-bevelled and openworked cage pillars
Gold Greubel Forsey counterweights
Displays
Hours and minutes
Small second sector (mean performance)
Power reserve on a sector
Tourbillon rotation indicator (outer cage)in 240 seconds
Habillage
Case
5N red gold with asymmetrical convex sapphire crystal
Transparent back with asymmetrical convex sapphire crystal
Lateral window with shaped sapphire crystal
3 dimensional, variable geometry-shaped lugs
Gold security screws
Case finishing
Polished bezel and centre band with hand-finished straight graining
Hand-engraved individual number
Raised engraving of the name of the Invention on a hand-punched background
Case dimensions
Diameter: 43.5 mm
Thickness: 16.11 mm
Water resistance of the case
3 atm – 30 m – 100 ft
Crown
5N red gold with engraved and black lacquered GF logo
Dial
Black dial
Gold appliqués
Gold display sectors
Applied gold logo
Hands
Hours and minutes, small seconds and power-reserve in gold
Strap
Hand-sewn black alligator leather with gold folding clasp, hand-embossed with the Greubel Forsey initials
This message has been edited by AnthonyTsai on 2009-02-19 07:33:44