Rolex Oyster Perpetual Universe Chronograph Daytona 904L Steel Watch This latest design combines high technology with extraordinary beauty. [Case] The size is 40Mm, the Oyster case is guaranteed to be waterproof to 100 meters, and the case is made of a single piece of solid 904L steel. [Mirror surface] The mirror surface is made of sapphire crystal, which is not easy to scratch. [Movement] The 7750 movement is used, which is efficient, precise and stable. [Bracelet] The watch is equipped with a folding clasp, which is also made of 904L steel, and the clasp has a fine-tuning device that can be adjusted to fit the wrist very well. Produced by TW, it must be a boutique