Noticeable with the caseback, the oscillating mass with the motion is delicately engraved. It truly is made out of eighteen-karat gold and decorated by hand by using a barley grain pattern, performed by guilloche If the Omega has the words 'Master Chronometer' to the dial—as is observed from the Seamaster https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/