Obvious in the caseback, the oscillating mass with the motion is delicately engraved. It truly is made out of eighteen-karat gold and decorated by hand which has a barley grain pattern, finished by guilloche Hailing from Redondo Seashore, California, Sean’s passion for layout and all things mechanical commenced at birth. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/