brandoncra: You have a S&W Victory Model revolver manufactured for the US government between 1942 & September 1944. This was a wartime finish variant of the S&W Military & Police Model of 1905 4th change. It shared the same serial range as the British Service Revolver made for the Commonwealth forces during WWII. The main difference was caliber, with the Victory Model being .38 Special, and barrel length, with the Victory Model having a 4 inch barrel.
The number stamped on the crane is an assembly number, used to track parts in the factory and has no relevance once the gun is assembled. I don't know what the S on the cylinder signifies, my 1970s manufactured Model 66 also has it.
Note that a fatality occurred in 1944 when a Victory model was dropped on it's hammer, causing it to fire. This lead to the introduction of the hammer block safety still used by S&W. It may be prudent to keep your hammer down on an empty chamber if using the gun.