Early Races were typically timed by stopwatches mounted to car or truck dashboards, but as the complication was shrunk, they were being far more normally seen on wrists, especially in the F1 and endurance racing heyday involving the ’50s and ’70s. Encouraged by British pilot’s watches in the 1970s, Hamilton’s https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/