Even Further proving its mastery of chronographs and particularly superior-frequency precision, ZENITH unveils the DEFY El Primero 21 with a new El Primero calibre beating in a phenomenal fee of 50Hz for an exact 1/one centesimal of a second chronograph functionality. I bought a view from Watches World and the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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