Further Proving its mastery of chronographs and especially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating in a phenomenal level of 50Hz for an precise one/100th of the 2nd chronograph purpose. The Speedmaster will get each of the enjoy in Omega’s https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/