More Proving its mastery of chronographs and exclusively substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating at a phenomenal rate of 50Hz for an precise 1/100th of the 2nd chronograph functionality. Chronographs — with their bezels, scales and sub-dials — are https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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