Noticeable through the caseback, the oscillating mass in the motion is delicately engraved. It can be produced from eighteen-karat gold and decorated by hand by using a barley grain pattern, done by guilloche The nautical design is water-proof with chronograph performance, Daring hour markers and also a day window, all https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/