Even More proving its mastery of chronographs and precisely significant-frequency precision, ZENITH unveils the DEFY El Primero 21 that has a new El Primero calibre beating in a phenomenal rate of 50Hz for an exact one/a centesimal of a second chronograph function. It partnered Using the Neuchâtel Tourism Office environment https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/