In 1913, Blériot Remembers ZENITH’s precision Using these words and phrases that he shared inside the model’s guestbook: “I'm incredibly satisfied with the ZENITH observe which I generally use And that i are unable to recommend it extremely adequate to individuals that treatment about accuracy”. 6 miles, or 55.7 km) https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/