In the avalanche of new-generation tourbillons, Greubel Forsey stands out in the extreme art of watchmaking.
The superb and very innovative Double Tourbillon 30˚ is ‘a tourbillon inside a tourbillon’ with its two mobile
cages connected to each other at an angle of 30˚. Dubbed by its creators as the Tourbillion of the third millennium, its principal advantage is that it can compensate for the variations in operation (due to the forces of gravity) not only when in a vertical position, but also in any position. The result is that the watch keeps more precise time than a classic tourbillon measured in six positions, (+/- minus seven seconds): the Greubel Forsey Double Tourbillon 30º has a difference of +/- two seconds.
In order that one can appreciate the richness and diversity of what Robert Greubel and Stephen Forsey the ‘inventor-watchmakers’ have created, here is what lies behind this unique revolution within a revolution.
18 carat red or white gold, or platinum case (43.5 x 15.76) equipped with a hand-winding Calibre GF 02 Movement, with double tourbillon 30°: exterior tourbillon rotating cycle of 4 minutes, interior tourbillon rotating cycle of 1 minute. 72-hour power reserve indicator, rapid rotating twin barrels (1 turn in 3.2 hours) one of which is equipped with a slipping spring so as to avoid excess tension, free sprung balance wheel with white gold mean-time screws (10mm diameter), 21,600 v.p.h., frosted nickel silver bridges, finished in ‘jade gold’. Hours and minutes indications, small seconds and rotating cycle of 1 minute on subsidiary dial at 9 o’clock, indicator of exterior tourbillon rotation cycle of 4 minutes at 6 o’clock, sectorial power reserve indicator decentred at 3 o’clock, convex sapphire crystal front and back, black or brown alligator strap with folding clasp, water-resistant to 30 metres.
Source: Europa Star April-May 2006 Magazine Issue