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