Even More proving its mastery of chronographs and precisely superior-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal price of 50Hz for an exact 1/a hundredth of a second chronograph operate. All our efforts ended up directed towards providing the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/