Visible throughout the caseback, the oscillating mass of your movement is delicately engraved. It is actually produced from eighteen-karat gold and decorated by hand with a barley grain sample, performed by guilloche A paragon of robustness and trustworthiness, the 40 mm Oyster case of The brand new GMT-Learn II is https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/