Cartier, Santos series, model: W20121U2, automatic mechanical, stainless steel, rubber-coated, case diameter: 38mm. It is the old Santos 100 (distinguished from the new Santos after 2018), with a high recognition rate: a square and tough case, exposed "screw" decoration, rubber bezel + rubber strap, and a very strong casual and sporty style. Compared with the steel band version, the black rubber version is more suitable for daily use, is not afraid of bumps and knocks, and has a strong presence when held.