Further More proving its mastery of chronographs and specifically substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating in a phenomenal charge of 50Hz for an accurate 1/one centesimal of the second chronograph function. Declaring the winner with the race to create https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/