Further More proving its mastery of chronographs and especially higher-frequency precision, ZENITH unveils the DEFY El Primero 21 using a new El Primero calibre beating at a phenomenal price of 50Hz for an accurate one/one centesimal of the next chronograph perform. The Speedmaster gets the many appreciate in Omega’s chronograph https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/