Noticeable in the caseback, the oscillating mass in the motion is delicately engraved. It is constructed from eighteen-karat gold and decorated by hand using a barley grain sample, completed by guilloche A gold Model includes a black dial and black leather-based strap, and also an 18-karat gold pin-buckle We're happy https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/