Early Races were typically timed by stopwatches mounted to motor vehicle dashboards, but given that the complication was shrunk, they ended up far more generally found on wrists, especially in the F1 and endurance racing heyday between the ’50s and ’70s. Chronographs — with their bezels, scales and sub-dials — https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/