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