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Double Tourbillon 30 Degrees Secret
A well-guarded secret
When introducing their Double Tourbillon 30° at BaselWorld 2004, Inventor Watchmakers Robert Greubel and Stephen Forsey had defined an architectural approach focusing on the visibility of their invention, so as to ensure complete visual access to the double cage and its incredible mechanical choreography.
Dedicated to connoisseurs of Haute Horlogerie with a preference for discretion and for whom observing the mechanism is an intensely personal pleasure, the Double Tourbillon 30° now appears in a less extrovert and one might almost say ‘secretive’ style, even though such a splendid dial naturally hints at the treasure it is guarding.
This exquisitely crafted matt-finished gold dial suggests the presence of an exceptional mechanism, thanks to its unusual and particularly wide subdial at 6 o’clock with a slender blued steel hand testifying to the four-minute rotation of the outer cage of the Double Tourbillon 30°.
    
The power-reserve is displayed on a sector indicating the full 72 hours of perfect operation provided by rapid-rotating twin barrels. Issued in a strictly limited edition of 11, the Double Tourbillon 30° “Secret” comes in a white gold case that is entirely polished, apart from the centre band of the case which is delicately straight-grained by hand.
    
Fortunately however, the secret of this Double Tourbillon 30° is not impenetrable and, although hidden from view on the wrist, the choreographic performance of the cages may nonetheless be admired through the case-back protected by a domed sapphire crystal. The 128 parts making up the first fundamental Greubel Forsey invention weigh a total of 1.17 grams, enabling the variable-inertia balance to oscillate to and fro three times a second, whereas its rotation axis shifts constantly due to the relative speeds of the cages and the 30° angle that links them together.
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