On The list of chronograph’s earliest employs was timing horse races, so By natural means, the complication progressed when horses made way for horsepower. Declaring the winner from the race to make the very first computerized chronograph in 1969 is contentious business enterprise, so Zenith’s “El Primero” moniker is arguable. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/