Even Further proving its mastery of chronographs and especially superior-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating in a phenomenal amount of 50Hz for an accurate one/a centesimal of a second chronograph operate. Ideal for people who benefit straightforwardness just as much https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/