Robert Greubel and Stephen Forsey have engineered the four Tourbillons together in a contemporary design, in which elegance and harmony are the dominant features. In the same spirit, and owing to the impressive number of parts which make up the movement, an asymmetrically-shaped case was chosen. The asymmetrical form was also an aesthetic tribute to the asynchronicity of the four Tourbillons. To complement the homogeneous ensemble, the displays of the small second and the power reserve dials are semi-circular.
Transparent sapphire bridges were specifically chosen to allow unimpaired visual access to the perfectly choreographed aerial ballet of the four Tourbillons.
With its sophisticated coalescence of technical Invention and artistic design, the Quadruple Tourbillon à Différentiel encapsulates the best in fine watchmaking.
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:
Platinum 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 backgroundor leather with gold folding clasp, hand-embossed with the Greubel Forsey initials
Case dimensions:
Diameter:43.5 mm
Thickness:16.06 mm
Water resistance of the case: 3 atm – 30 m – 100 ft
Crown: Platinum with engraved and black lacquered GF logo
Dial:
Gold dial
Gold appliques
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 ■
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