Early Races have been typically timed by stopwatches mounted to automobile dashboards, but as being the complication was shrunk, they were more usually viewed on wrists, especially in the F1 and endurance racing heyday in between the ’50s and ’70s. Inspired by British pilot’s watches from your 1970s, Hamilton’s Khaki https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/