Obvious through the caseback, the oscillating mass with the movement is delicately engraved. It is actually constructed from 18-karat gold and decorated by hand by using a barley grain pattern, finished by guilloche A gold Edition features a black dial and black leather strap, together with an 18-karat gold pin-buckle https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/