Zenith presents world’s most accurate mechanical watch

From Zenith headquarters: A new oscillator representing a major innovation in the watch industry since the 1675 invention of the balance and hairspring principle by scientist Christiaan Huygens. The 21st century Defy Lab achieves exceptional performance making it a master of mechanical precision powered into a whole new dimension.

Zenith has been making mechanical watches for 152 years and connoisseurs will scarcely need reminding of the paternity of the Swiss watch industry’s first ever automatic chronograph introduced in 1969, which also featured a function that had not been seen at the time. The El Primero movement is often cited as a Swiss watchmaking legend. Nobody was capable of measuring tenths of a second, the unit of time naturally stemming from a 5 Hz oscillation frequency.

Jean-Claude Biver, President of the Watch Division, Zenith CEO Julien Tornare and Guy Sémon, CEO of the Science Institute LVMH announced the innovation.

The material used for the Zenith Oscillator is monocrystalline silicon coated with a layer of silicon oxide. The absence of conventional mechanical couplings in this system eliminates contact, friction, wear, slack, lubrication, assemblies and dispersions.

Defy Lab is the first and only mechanical watch embodying both an evolution and an improvement of the sprung balance principle presented in January 1675. A new oscillator forming a monolithic whole, made of monocrystalline silicon (with details finer than a human hair), replaces the sprung balance. The 30 or so components of a standard regulating organ (which requires assembly, adjustment, timing, testing and lubrication) are thus replaced by a single element measuring just 0.5 mm thick (compared with the usual 5 mm.)

This breathtaking development beats at the incredible frequency of 15 Hertz, with an amplitude of +/- 6 degrees, and is endowed with an almost 60-hour power reserve – more than 10% more than that of the El Primero – despite a three times higher frequency.

This frequency endows it with an exceptional – almost 10 times higher – degree of accuracy. Its mean daily rate is precise to within just 0.3 seconds. (By way of example, one of the criteria for COSC “chronometer” certification is the average daily rate on the first ten days of testing: from -4 seconds to +6 seconds, meaning up to 10 seconds per day).