Even More proving its mastery of chronographs and exclusively high-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating at a phenomenal price of 50Hz for an precise 1/100th of the second chronograph perform. It had been our enjoyment To help you in https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/