OK, the owner doesn't want it going anywhere just yet. Guns International has a service where they appraise a firearm for a fee from your photographs and written description. For $75, it worth a try. I will post The results when I get them. Now to get the owner to bring it back.
I had this problem with another owner when he brought me an 1850 something Butterfield Pistol. He got so hyped up watching "Pawn Stars" that he decided he'd be better off driving out to Las Vegas and selling it himself. I had to give up on him and his pistol.