Even Further proving its mastery of chronographs and particularly high-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating in a phenomenal level of 50Hz for an accurate 1/a centesimal of the second chronograph operate. To promote the art of watchmaking to as https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/