More Proving its mastery of chronographs and especially significant-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating in a phenomenal fee of 50Hz for an exact one/a centesimal of a second chronograph functionality. The term “chronometer” took on a rather broader meaning https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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