Early Races ended up mainly timed by stopwatches mounted to automobile dashboards, but since the complication was shrunk, they ended up much more generally witnessed on wrists, specifically in the F1 and endurance racing heyday amongst the ’50s and ’70s. Impressed by British pilot’s watches through the 1970s, Hamilton’s Khaki https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/