Omega Released its Constellation Globemaster, the initial 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 don't just aced the tests demanded for COSC chronometer certification but happen to be subjected to another, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/