Visible with the caseback, the oscillating mass on the movement is delicately engraved. It's produced from 18-karat gold and decorated by hand which has a barley grain pattern, accomplished by guilloche A gold Edition includes a black dial and black leather-based strap, as well as an 18-karat gold pin-buckle Tone https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/