Down The road, Arnold’s chronometers would serve crucial roles in famous voyages, because the devices helped navigators estimate their longitude. Declaring the winner on the race to create the primary automatic chronograph in 1969 is contentious business, so Zenith’s “El Primero” moniker is arguable. That’s the name on the motion https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/