I purchased this shotgun from a vet (usmc) it's been re-arsenaled and this serial number comes up on a list of usmc trench shotguns that had been sent for repair in 1942 and issued by the usmc quarter master..I blocked the last two digit s for privacy. Serial #9453XX . What is the value? I had no idea it was listed in" combat shotguns" book when I paid $1, 100.