More Proving its mastery of chronographs and exclusively large-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating in a phenomenal level of 50Hz for an accurate one/100th of a 2nd chronograph function. Although black-coated scenarios are inclined to look more compact within the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/