Early Races were being mainly timed by stopwatches mounted to vehicle dashboards, but as being the complication was shrunk, they were being much more often found on wrists, specifically in the F1 and endurance racing heyday between the ’50s and ’70s. Inspired by British pilot’s watches in the nineteen seventies, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/