In 1913, Blériot Remembers ZENITH’s precision with these words and phrases that he shared while in the brand’s guestbook: “I'm pretty content with the ZENITH look at which I typically use and I can't recommend it hugely adequate to individuals that care about precision”. six miles, or fifty five.7 km) https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/