In 1913, Blériot Recollects ZENITH’s precision with these phrases that he shared during the manufacturer’s guestbook: “I'm extremely content with the ZENITH observe which I usually use And that i can't advise it remarkably ample to folks who care about accuracy”. Tissot traces its prolonged record back again to 1853, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/