In 1913, Blériot Remembers ZENITH’s precision with these words that he shared from the brand name’s guestbook: “I'm pretty content with the ZENITH check out which I typically use and I can not advocate it hugely sufficient to those who care about precision”. six miles, or fifty five.seven km) at https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/