Obvious from the caseback, the oscillating mass from the movement is delicately engraved. It's made from 18-karat gold and decorated by hand having a barley grain pattern, accomplished by guilloche So In the event your Omega has the phrases ‘Grasp Chronometer’ around the dial—as is seen Within this signature Omega https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/