Further More proving its mastery of chronographs and specially significant-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating in a phenomenal price of 50Hz for an correct 1/one centesimal of a 2nd chronograph operate. It partnered Together with the Neuchâtel Tourism Workplace https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/