In 1913, Blériot Recollects ZENITH’s precision with these words that he shared while in the manufacturer’s guestbook: “I am pretty content with the ZENITH look at which I usually use and I simply cannot advise it very ample to people who treatment about accuracy”. Lange & Söhne. I’ll describe why: https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/