Early Races have been generally timed by stopwatches mounted to motor vehicle dashboards, but as being the complication was shrunk, they were more frequently seen on wrists, especially in the F1 and endurance racing heyday involving the ’50s and ’70s. Chronographs — with their bezels, scales and sub-dials — in https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/