More Proving its mastery of chronographs and particularly superior-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating at a phenomenal level of 50Hz for an precise 1/one centesimal of a 2nd chronograph operate. I purchased a observe from Watches World and the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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