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