Additional Proving its mastery of chronographs and specially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 using a new El Primero calibre beating at a phenomenal price of 50Hz for an correct 1/one centesimal of a 2nd chronograph operate. All our initiatives have been directed in direction of providing https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/