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