El Primero Chronomaster


Zenith: El Primero Chronomaster

In 1969, Zenith made its stellar contribution to the Chronograph saga with El Primero (“the first” in Esperanto): first integrated automatic column-wheel mechanism, oscillating at a cadence of 36,000 vibrations per hour (5Hz) and displaying a precision, certified chronometer, to the nearest tenth of a second... It remains to this day the most accurate series caliber in the world.