Additional Proving its mastery of chronographs and specifically higher-frequency precision, ZENITH unveils the DEFY El Primero 21 having a new El Primero calibre beating at a phenomenal level of 50Hz for an precise 1/a hundredth of the next chronograph functionality. Now decades considering the fact that its debut, TAG has https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/