With The development from the ZENITH calibre, the Manufacture’s founder was perfectly on his way to achieve his star: The creation of the trustworthy motion utilizing standardised output methods. Declaring the winner with the race to build the initial computerized chronograph in 1969 is contentious business, so Zenith’s “El Primero” https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/