Even More proving its mastery of chronographs and especially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal charge of 50Hz for an exact one/100th of a next chronograph functionality. It was our satisfaction to assist you in paying for https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/