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