Noticeable in the caseback, the oscillating mass in the movement is delicately engraved. It can be produced from 18-karat gold and decorated by hand that has a barley grain sample, done by guilloche A gold Edition features a black dial and black leather strap, along with an eighteen-karat gold pin-buckle https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/