Noticeable in the caseback, the oscillating mass on the movement is delicately engraved. It's made out of 18-karat gold and decorated by hand that has a barley grain pattern, completed by guilloche Additional to that, Regardless of its slim profile at the sting with the calibre, the sleek oscillating mass https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/