Seen with the caseback, the oscillating mass of your movement is delicately engraved. It's produced from 18-karat gold and decorated by hand which has a barley grain sample, done by guilloche So Should your Omega has the words ‘Grasp Chronometer’ to the dial—as is found In this particular signature Omega https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/