Early Races were being primarily timed by stopwatches mounted to motor vehicle dashboards, but since the complication was shrunk, they have been far more typically viewed on wrists, especially in the F1 and endurance racing heyday in between the ’50s and ’70s. Inspired by British pilot’s watches through the 1970s, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/