Seen with the caseback, the oscillating mass of the movement is delicately engraved. It can be created from eighteen-karat gold and decorated by hand with a barley grain sample, done by guilloche A gold Variation includes a black dial and black leather strap, and an eighteen-karat gold pin-buckle What's more, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/