The polished blue bi-directional rotating bezel is compelete by using a vibrant orange GMT scale and helium-escape valve at 10 o'clock on the case. It requires the melting on the Uncooked substance using oxyhydrogen flame as well as the crystallisation of the melted droplets to form a cylinder. Graded 9 https://www.watchesworld.com/top-10-dive-watches/