Additional Proving its mastery of chronographs and precisely superior-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating in a phenomenal level of 50Hz for an accurate 1/100th of a second chronograph purpose. It absolutely was our satisfaction to assist you in getting https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/