In 1913, Blériot Recalls ZENITH’s precision with these words that he shared inside the model’s guestbook: “I'm very satisfied with the ZENITH enjoy which I ordinarily use And that i are unable to advise it remarkably adequate to people that treatment about accuracy”. six miles, or fifty five.seven km) at https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/