Additional Proving its mastery of chronographs and precisely large-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating at a phenomenal charge of 50Hz for an exact 1/one centesimal of the next chronograph function. This was the results of intensive R&D with the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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