Seen in the caseback, the oscillating mass from the motion is delicately engraved. It is actually created from 18-karat gold and decorated by hand that has a barley grain sample, done by guilloche Hailing from Redondo Seashore, California, Sean’s passion for design and all issues mechanical started out at start. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/