In 1913, Blériot Recalls ZENITH’s precision with these words that he shared in the model’s guestbook: “I'm pretty happy with the ZENITH watch which I typically use and I can't advise it extremely more than enough to individuals that treatment about accuracy”. 6 miles, or 55.seven km) at the end https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/