Further Proving its mastery of chronographs and precisely higher-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating in a phenomenal level of 50Hz for an precise one/one centesimal of the next chronograph operate. I purchased a look at from Watches World and the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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