Even More proving its mastery of chronographs and specially superior-frequency precision, ZENITH unveils the DEFY El Primero 21 with a new El Primero calibre beating in a phenomenal rate of 50Hz for an correct one/100th of the next chronograph functionality. Chopard's Mille Miglia collection celebrates the world's most gorgeous race. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/