More Proving its mastery of chronographs and especially substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 using a new El Primero calibre beating at a phenomenal rate of 50Hz for an accurate 1/a centesimal of a next chronograph functionality. Declaring the winner with the race to build the 1st https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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