Further More proving its mastery of chronographs and specially substantial-frequency precision, ZENITH unveils the DEFY El Primero 21 which has a new El Primero calibre beating at a phenomenal charge of 50Hz for an exact one/100th of a 2nd chronograph functionality. Be occasion ideal: Remember The essential policies: black leather-based https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/