Further Proving its mastery of chronographs and especially substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating at a phenomenal charge of 50Hz for an precise one/a hundredth of the second chronograph functionality. Declaring the winner of your race to construct the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/