Visible in the caseback, the oscillating mass of the motion is delicately engraved. It's made out of eighteen-karat gold and decorated by hand which has a barley grain sample, carried out by guilloche So In the event your Omega has the phrases ‘Grasp Chronometer’ around the dial—as is seen In https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/