In A while, Arnold’s chronometers would serve important roles in legendary voyages, as being the devices helped navigators estimate their longitude. Declaring the winner of the race to make the main computerized chronograph in 1969 is contentious business enterprise, so Zenith’s “El Primero” moniker is arguable. That’s the name on https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/