Further Proving its mastery of chronographs and particularly substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating at a phenomenal amount of 50Hz for an exact 1/a hundredth of the 2nd chronograph purpose. Declaring the winner in the race to create the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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