In 1913, Blériot Remembers ZENITH’s precision with these phrases that he shared in the brand name’s guestbook: “I am very happy with the ZENITH observe which I ordinarily use And that i can not suggest it highly ample to individuals who treatment about accuracy”. 6 miles, or fifty five.7 km) https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/