Further Proving its mastery of chronographs and specially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating in a phenomenal price of 50Hz for an correct 1/one centesimal of the next chronograph function. Thank you again for choosing Watches World! We remain https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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