Early Races were primarily timed by stopwatches mounted to auto dashboards, but because the complication was shrunk, they have been much more normally found on wrists, particularly in the F1 and endurance racing heyday involving the ’50s and ’70s. I'd happily use Watches World once again and would endorse them https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/