One Of several chronograph’s earliest uses was timing horse races, so Obviously, the complication evolved when horses created way for horsepower. Declaring the winner in the race to develop the initial automated chronograph in 1969 is contentious company, so Zenith’s “El Primero” moniker is arguable. That’s the title from the https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/