In 1913, Blériot Recollects ZENITH’s precision with these terms that he shared from the model’s guestbook: “I'm very pleased with the ZENITH check out which I usually use and I are not able to recommend it hugely more than enough to individuals who care about precision”. 6 miles, or 55.7 https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/