Even More proving its mastery of chronographs and specifically significant-frequency precision, ZENITH unveils the DEFY El Primero 21 with a new El Primero calibre beating in a phenomenal amount of 50Hz for an precise 1/one centesimal of a next chronograph operate. 1844: Adolphe Nicole introduces the reset element, enabling different https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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