Oyster case is used in all other Rolex watches except the Cellini, meaning that the editions with the casing are water-resistant over 100m. That shouldn't be considered an approval to swim or shower with your watch on. If you go into the shower with your Rolex, the rubber gaskets and spring bars could get damaged due to the soaps. Spring bars will wear out quickly due to the effect of the soap residue. Rubber can expand due to the heat in the shower. Sudden expansion and contraction of the gaskets could lead to serious damage to your watch. You can go into the water with the watch, but be careful while handling it. Check out here to know more about Rolex watch - https://www.fakerolex.io/