Visible in the caseback, the oscillating mass of your motion is delicately engraved. It truly is produced from 18-karat gold and decorated by hand which has a barley grain sample, performed by guilloche Should your Omega has the words 'Master Chronometer' around the dial—as is viewed from the Seamaster Diver https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/