Further Proving its mastery of chronographs and specifically large-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating at a phenomenal rate of 50Hz for an accurate one/100th of a second chronograph functionality. Tudor’s Black Bay line is on fireplace with collectors. That https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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