Early Races ended up mostly timed by stopwatches mounted to auto dashboards, but given that the complication was shrunk, they were more typically viewed on wrists, specifically in the F1 and endurance racing heyday between the ’50s and ’70s. I'd personally Fortunately use Watches World once again and would propose https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/