In 1913, Blériot Recalls ZENITH’s precision with these text that he shared within the manufacturer’s guestbook: “I'm incredibly satisfied with the ZENITH view which I normally use And that i can't advise it very adequate to individuals that care about precision”. The third significant action transpired during the early 1900’s. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/