Even More proving its mastery of chronographs and exclusively substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal fee of 50Hz for an accurate 1/a centesimal of a second chronograph purpose. Best for people who price straightforwardness about precision, the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/