Early Races were mostly timed by stopwatches mounted to car or truck dashboards, but as the complication was shrunk, they have been more generally noticed on wrists, particularly in the F1 and endurance racing heyday among the ’50s and ’70s. Chronographs — with their bezels, scales and sub-dials — in https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/