Seen throughout the caseback, the oscillating mass of your motion is delicately engraved. It's comprised of eighteen-karat gold and decorated by hand using a barley grain sample, done by guilloche The Diver 300M is obtainable in metal or combos of metal and yellow or Sedna gold, having a strap in https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/