In 1913, Blériot Recalls ZENITH’s precision with these words that he shared inside the manufacturer’s guestbook: “I am very content with the ZENITH check out which I ordinarily use And that i simply cannot endorse it very adequate to people that treatment about precision”. Lange & Söhne. I’ll explain why: https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/