Even More proving its mastery of chronographs and specifically superior-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal level of 50Hz for an precise 1/one hundredth of a 2nd chronograph function. ZENITH proceeds Checking out Imaginative watchmaking solutions when creating https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/