Frank, Tucker Gun Inc. (770)856-2351 has a good bit of original mil-surp holsters, belts, cartridge belts, etc. They might have a correct magazine for that gun of yours. If you call them, ask for Scott, Phil, or Lee and tell them I gave you their phone number.

I would look inside the mag well to determine the loss of finish in that area, and attempt to find a magazine that matched that wear as evenly as possible, if I were trying to make it appear 100% original.

Hugh Brock could give you a accurate appraisal on it's value if you care to drive near Athens, GA where he re-located.