Among The chronograph’s earliest employs was timing horse races, so Normally, the complication progressed when horses made way for horsepower. Declaring the winner in the race to build the first automated chronograph in 1969 is contentious business, so Zenith’s “El Primero” moniker is arguable. That’s the name on the movement https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/