Roy, can you provide pictures of it? It does sound like a post war proofing / marking, but a good picture or two would help very much,
Have you looked through the proofs and markings on this site to see if any match?
go to
www.lugerforum.com then technical and then proof markings and take a look.
Also, not to doubt the vet or you, but I have heard stories of "this is the gun I brought back" and it couldn't be, because it has wrong proofs etc., on it.
Ed