Seen throughout the caseback, the oscillating mass on the motion is delicately engraved. It's constructed from eighteen-karat gold and decorated by hand by using a barley grain sample, carried out by guilloche A paragon of robustness and reliability, the 40 mm Oyster circumstance of the new GMT-Grasp II is confirmed https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/