Further More proving its mastery of chronographs and exclusively higher-frequency precision, ZENITH unveils the DEFY El Primero 21 by using a new El Primero calibre beating at a phenomenal fee of 50Hz for an exact 1/a hundredth of the next chronograph function. The Speedmaster gets all the appreciate in Omega’s https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/