In 1913, Blériot Remembers ZENITH’s precision Using these words and phrases that he shared from the manufacturer’s guestbook: “I'm really happy with the ZENITH look at which I ordinarily use and I simply cannot advocate it remarkably enough to individuals that care about accuracy”. ZENITH launches the 135-Observatoire restricted version, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/