More Proving its mastery of chronographs and especially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal charge of 50Hz for an precise one/100th of a second chronograph operate. 1844: Adolphe Nicole introduces the reset characteristic, allowing for distinctive instances https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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