Early Races were being generally timed by stopwatches mounted to motor vehicle dashboards, but since the complication was shrunk, they were much more frequently viewed on wrists, especially in the F1 and endurance racing heyday amongst the ’50s and ’70s. This was the result of intensive R&D through the Manufacture, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/