Even Further proving its mastery of chronographs and especially superior-frequency precision, ZENITH unveils the DEFY El Primero 21 using a new El Primero calibre beating at a phenomenal amount of 50Hz for an correct 1/100th of the next chronograph functionality. 1844: Adolphe Nicole introduces the reset aspect, allowing diverse instances https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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