Even More proving its mastery of chronographs and precisely large-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating in a phenomenal price of 50Hz for an exact one/a hundredth of a next chronograph function. Tudor’s Black Bay line is on fire with https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/