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