Even Further proving its mastery of chronographs and specifically significant-frequency precision, ZENITH unveils the DEFY El Primero 21 that has a new El Primero calibre beating at a phenomenal fee of 50Hz for an correct one/a hundredth of the next chronograph function. We delivered you with all vital information regarding https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/