Even More proving its mastery of chronographs and especially high-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal rate of 50Hz for an accurate one/100th of the 2nd chronograph purpose. Even though black-coated circumstances are likely to look scaled-down to https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/