Even More proving its mastery of chronographs and exclusively high-frequency precision, ZENITH unveils the DEFY El Primero 21 that has a new El Primero calibre beating in a phenomenal price of 50Hz for an precise one/a centesimal of a 2nd chronograph functionality. Impressed by British pilot’s watches through the nineteen https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/