In 1913, Blériot Recollects ZENITH’s precision with these terms that he shared in the model’s guestbook: “I am quite happy with the ZENITH look at which I generally use And that i are not able to advise it remarkably ample to individuals who treatment about precision”. There you've got it, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/