Early Races have been primarily timed by stopwatches mounted to motor vehicle dashboards, but as the complication was shrunk, they were more generally witnessed on wrists, particularly in the F1 and endurance racing heyday in between the ’50s and ’70s. This was the results of intense R&D with the Manufacture, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/