Even Further proving its mastery of chronographs and especially significant-frequency precision, ZENITH unveils the DEFY El Primero 21 that has a new El Primero calibre beating in a phenomenal price of 50Hz for an precise 1/one centesimal of the 2nd chronograph operate. All our attempts were directed in the direction https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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