Further More proving its mastery of chronographs and especially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 with a new El Primero calibre beating in a phenomenal charge of 50Hz for an exact 1/one centesimal of the second chronograph perform. It partnered with the Neuchâtel Tourism Business to build https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/