With The development on the ZENITH calibre, the Manufacture’s founder was well on his way to achieve his star: The creation of the dependable movement applying standardised manufacturing strategies. Declaring the winner of the race to create the 1st automated chronograph in 1969 is contentious organization, so Zenith’s “El Primero” https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/