Further More proving its mastery of chronographs and especially high-frequency precision, ZENITH unveils the DEFY El Primero 21 with a new El Primero calibre beating in a phenomenal fee of 50Hz for an precise 1/one centesimal of the 2nd chronograph function. Chopard's Mille Miglia selection celebrates the world's most gorgeous https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/