Early Races were being generally timed by stopwatches mounted to car or truck dashboards, but as the complication was shrunk, they had been much more normally viewed on wrists, particularly in the F1 and endurance racing heyday concerning the ’50s and ’70s. Inspired by British pilot’s watches within the seventies, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/