Finding the system that will do for wrist watches what the Tourbillon did for pocket watches is one of the great challenges of the 21st Century. Since the beginning, the best watchmakers have tried to defy the effects of gravity, that sworn enemy of accuracy. In a veritable technical revolution, ZENITH Manufacture has devised the Zero-G system, in other words zero gravity.
The gyroscope cage Tourbillon comprises an escapement mounted on cardan joints rather like marine chronometers. The instrument, which is sensitive to changes of position, is kept in a constant horizontal position, thereby ensuring optimal amplitude for the spiral balance wheel.
Coordination is provided by an invention patented by ZENITH: a second gear train is the reference point for the swinging of the escapement axles and a differential gear with inverter compensates all the relative movements of the framework.
The Zero-G Tourbillon, whose cage alone comprises 166 out of the 294 parts that make up the device, 10 conical geared wheels with spiral teeth and 6 ball-bearings, was developed from the El Primero automatic caliber that beats at the record speed of 36,000 vibrations an hour.
Defy Classic does justice to the Zero-G with a breathtakingly designed construction, reminiscent of the terrestrial globe. Symbolising infinity or a lucky number, a figure of 8 on its side is drawn around the hours and minutes display at 11 o’clock and around the opening of the phenomenal Tourbillon at 5 o’clock.
The sophisticated, multi-layered dial shines beneath 4 anti-reflective sapphire glass plates. This precious creation clad in rose gold and brown alligator is available in a numbered edition with the 2008 millésime.
Model: Zenith Defy Classic Zero-G Tourbillon
Caliber NEW El Primero 8800
Automatic movement with unique gyroscopic system that ensures perfect horizontal positioning of the regulating organ
Gyroscopic cage made of 166 components, 10 conical-geared wheels (with 6 spherical wheels) & 6 ball bearings
36’000 vibrations per hour
Power reserve over 50 hours
Automatic winding in both directions
Excentered rotor, in Platinum, on ball bearings
Hour and minutes excentered at 11 o’clock
Gyroscopic cage with second indicator at 5 o’clock
Brushed rose gold case
Case diameter: 46.5 mm
Rose gold screw-in crown engraved with ZENITH star
Rose gold bezel with gold screw-heads & satin-finished cone-shaped indexes
Rose gold case back
Water-resistance up to 300 meters
Crystal: 5 anti-reflective sapphire glasses;4 front sapphire glasses & 1 at the back
Silver fully guilloché dial; Applied gold numerals and indexes
Hands : Brushed rose gold faceted luminous hands with white Superluminova inserts
Brown handmade alligator leather strap
Buckle: Brushed rose gold tongue buckle