Omega Introduced its Constellation Globemaster, the very first timepiece branded with the “Learn Chronometer” designation, in 2015. Watches using this type of accolade — which now comprise the lion’s share of Omega's output — have not simply aced the exams needed for COSC chronometer certification but are subjected to another, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/