Further More proving its mastery of chronographs and specially significant-frequency precision, ZENITH unveils the DEFY El Primero 21 using a new El Primero calibre beating in a phenomenal level of 50Hz for an correct one/100th of a second chronograph function. When you purchase through inbound links on our web site, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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