Further More proving its mastery of chronographs and particularly higher-frequency precision, ZENITH unveils the DEFY El Primero 21 using a new El Primero calibre beating in a phenomenal price of 50Hz for an accurate 1/a centesimal of a second chronograph function. The Speedmaster will get the many appreciate in Omega’s https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/