Noticeable in the caseback, the oscillating mass on the movement is delicately engraved. It is actually made out of eighteen-karat gold and decorated by hand using a barley grain pattern, finished by guilloche Hailing from Redondo Seaside, California, Sean’s passion for design and all items mechanical started out at birth. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/