Luger ID

Thanks for the help. I didn't get a good look at the holster and am not certain its original. I don't know enough to know all of the locations to look for the serial number but the main number was 748xx and I noted the last 4 digits in various places on the gun. The frame, slide and barrel all had the same number as I recall. The inside of the bore had strong rifling and was dirty with no glaringly obvious pitting. The outside of the barrel did have some pitting. The grips the current owner got with the gun were worn plastic which he still has. The gun currently has a nice set of replacement walnut grips on it. Did not note any unit markings, but I've noted here the huge number of potential marks in the gun. I'm still up in the air as to whether this is a good buy. Any advice?