Even More proving its mastery of chronographs and especially substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating in a phenomenal amount of 50Hz for an accurate one/one centesimal of the 2nd chronograph purpose. Be situation proper: Keep in mind The fundamental procedures: https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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