Further More proving its mastery of chronographs and particularly substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 using a new El Primero calibre beating at a phenomenal amount of 50Hz for an precise one/100th of a 2nd chronograph purpose. Influenced by British pilot’s watches within the nineteen seventies, Hamilton’s https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/