Visible throughout the caseback, the oscillating mass in the movement is delicately engraved. It is actually comprised of eighteen-karat gold and decorated by hand that has a barley grain pattern, accomplished by guilloche A gold Edition encompasses a black dial and black leather-based strap, and an 18-karat gold pin-buckle It https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/