Greubel Forsey new version of the Quadruple Tourbillon - Baselworld 2009 preview | Independents

Greubel Forsey new version of the Quadruple Tourbillon - Baselworld 2009 preview

Press Release

Quadruple Tourbillon à Différentiel Sphérique
5N red gold case with lateral window, black dial

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 07:31:11

This message has been edited by MTF on 2009-02-21 01:58:10 This message has been edited by AnthonyTsai on 2009-03-01 21:42:29

💰2 Marketplace Listings for Greubel Forsey›

Nearly half the dial

By: MTF : February 21st, 2009-01:57

is covered by tourbillon view or air. That's some mighty expensive air-space er......what is a spherical differential for us with under-developed right brains? Regards, MTF

Regardless of any practical use or scientific evidence on the accuracy of a tourbillon, I really admire these guys for their technical skills. The fact they can build more than one is even more amazing. 1.7g for the cage weight. Talented and crazy. Hope t...

Independents