Antique plow "little genius 8" operational worth what?

International or mccormick little genius 8. 2 furrow plow with steel wheels. Seems to be working good. Not painted somewhat rusty. Good cutting edge and seems to be not too worn. How much is this worth, especially in Canada (or US if no Canadians). This is a "trip plow" and you pull it, not on a three point hitch or any sort of hydraulics.