Omega Launched its Constellation Globemaster, the first timepiece branded with the “Master Chronometer” designation, in 2015. Watches with this particular accolade — which now comprise the lion’s share of Omega's output — have not merely aced the checks demanded for COSC chronometer certification but are actually subjected to a different, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/