Rolex famously uses plain casebacks on its watches. The Rolex replica watches Submariner's screw-in caseback is devoid of any markings. The watches I have for review were loaned from our friends at the Rolex replica watches boutique nearby in Beverly Hills. We agreed not to remove the protective plastic on the sides of case, which you'll probably see in the pictures. There is also a type of bar code on the side of the case which is a serial identifier. That is removed when people buy the watch. Rolex replica watches uk uses a grade of steel called 904L. Most steel watches use 316L steel. The differences are minor, but involve more corrosion resistance in 904L steel from what I understand. So if your Rolex Submariner replica watches spends a lot of time in saltwater, then it will look better. It is widely known that Rolex replica watches sale is fanatical about their metal. They do a lot of metallurgy in-house, and not all steel of the same grade is made equal.