Further Proving its mastery of chronographs and exclusively significant-frequency precision, ZENITH unveils the DEFY El Primero 21 that has a new El Primero calibre beating at a phenomenal rate of 50Hz for an correct 1/a hundredth of a 2nd chronograph function. All our efforts have been directed in direction of https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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