What is a Revelation Single Shot 12 Gauge shotgun model 350 series p worth?

Obviously not enough to get excited over. I've taken mine to a reputable gunsmith/dealer, and he said they didn't cost a lot when they were made, and they aren't worth that much now. Mine is in above fair condition, kicks like a mule, but is accurate. So I'll just keep it for fun, and bag a deer now and then, just to keep it in service.

M.C. Michigan