Early Races were mainly timed by stopwatches mounted to car or truck dashboards, but since the complication was shrunk, they had been more frequently observed on wrists, particularly in the F1 and endurance racing heyday amongst the ’50s and ’70s. Complication: Refers to any watch motion beyond The easy tracking https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/