More Proving its mastery of chronographs and specially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 that has a new El Primero calibre beating in a phenomenal level of 50Hz for an accurate 1/one centesimal of a next chronograph operate. Declaring the winner with the race to develop the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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