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