In 1913, Blériot Recollects ZENITH’s precision with these words and phrases that he shared from the brand’s guestbook: “I'm quite content with the ZENITH observe which I generally use And that i cannot endorse it very ample to those who treatment about precision”. six miles, or fifty five.7 km) at https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/