Early Races have been generally timed by stopwatches mounted to motor vehicle dashboards, but because the complication was shrunk, they have been much more usually noticed on wrists, especially in the F1 and endurance racing heyday in between the ’50s and ’70s. I'd Fortunately use Watches World yet again and https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/