Further More proving its mastery of chronographs and specifically high-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating in a phenomenal fee of 50Hz for an accurate one/100th of a second chronograph perform. Declaring the winner of the race to build the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/