Since 1865, Zenith has been guided by authenticity, daring and passion in pushing the boundaries of excellence, precision and innovation. Soon after its founding in Le Locle by visionary watchmaker Georges Favre-Jacot, Zenith gained recognition for the precision of its chronometers, with which it has won 2,333 chronometry prizes in just over a century and a half of existence: an absolute record.
After the fundamental contribution to the chronograph history with the high frequency (5 Hz or 36,000 vibrations per hour) El Primero launched in 1969, Zenith made a giant leap with a new calibre beating at the ultra-high frequency of 50 Hz (360,000 vibrations per hour), ten times faster and more accurate than its predecessor.
This in-house made El Primero 9004 automatic movement is equipped with its own patented balance-springs made of Carbon-Matrix Carbon Nanotube composite. The exceptional physical and mechanical properties of this balance-springs with its graphene matrix render it insensitive to temperature and the influence of magnetic fields, well beyond the known 15,000 Gauss standard, thereby guaranteeing peerless precision in all conditions of use.