More Proving its mastery of chronographs and particularly high-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating at a phenomenal price of 50Hz for an accurate 1/one centesimal of a 2nd chronograph purpose. This was the results of intensive R&D by the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
Chronometer watches for Dummies
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