Further Proving its mastery of chronographs and precisely large-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating in a phenomenal charge of 50Hz for an exact 1/a hundredth of the second chronograph purpose. Suitable for people who price straightforwardness approximately precision, the Nomos https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/