In 1913, Blériot Recalls ZENITH’s precision with these terms that he shared during the manufacturer’s guestbook: “I am extremely pleased with the ZENITH watch which I ordinarily use and I can't advise it hugely ample to individuals who care about accuracy”. Both of those work on a similar rules but https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
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