Stainless-steel is unquestionably by far the most common of watchmaking products for outer craftsmanship, and offers attractiveness, energy and affordability. It involves the melting from the raw material using oxyhydrogen flame and the crystallisation in the melted droplets to sort a cylinder. Graded 9 on the Mohs-hardness scale (graded one-10), https://www.watchesworld.com/top-10-dive-watches/