With The development with the ZENITH calibre, the Manufacture’s founder was nicely on his way to achieve his star: The generation of a reliable motion employing standardised creation techniques. Declaring the winner with the race to construct the main computerized chronograph in 1969 is contentious company, so Zenith’s “El Primero” https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/