Even More proving its mastery of chronographs and specifically substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 with a new El Primero calibre beating in a phenomenal amount of 50Hz for an exact 1/one hundredth of a 2nd chronograph purpose. Thanks again for selecting Watches World! We keep on https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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