Thompson RENEGADE 50 cal. World's Fair Edition

I have a 1982 World's Fair Edition Thompson Renegade 50 cal. blackpowder rifle. I have taken several deer with it. It is one of the most accurate guns I own. Mine is now retired but in pretty good condition with the exception of the ramrod being cracked. It also has some surface scratches in the stock, but nothing all the way through the finish. Could anyone tell me what it might be worth?