Early Races were mainly timed by stopwatches mounted to car dashboards, but since the complication was shrunk, they were a lot more usually witnessed on wrists, especially in the F1 and endurance racing heyday between the ’50s and ’70s. This was the result of intensive R&D from the Manufacture, which https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/