Further Proving its mastery of chronographs and specifically substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal level of 50Hz for an precise 1/one centesimal of the 2nd chronograph purpose. 1844: Adolphe Nicole introduces the reset function, permitting diverse situations https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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