In 1913, Blériot Recalls ZENITH’s precision Using these words that he shared from the brand name’s guestbook: “I'm incredibly satisfied with the ZENITH enjoy which I generally use and I can't endorse it really adequate to folks who treatment about precision”. The 3rd huge phase occurred in the early 1900’s. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/