Zenith El Primero 3600

The latest evolution of Zenith's legendary El Primero high-frequency chronograph, running at 36,000 vph (5Hz) for chronograph timing resolution of 1/10th of a second. First introduced in 1969 as one of the world's first automatic chronographs, the El Primero's high beat rate enables the characteristic smooth sweep of the chronograph seconds hand. The 3600 variant offers a 60-hour power reserve while maintaining the iconic high frequency that defined the original.