Unless it's a rare or unusual version (eagle etching, or flatside frame, for example) it's probably not worth any more than any other Contender. If the barrel is an octagon, there are several "Types," some of which are more rare than others and can bring more money. Best thing to do would be to contact Ed Kirkpatrick at
www.edstc.com, describe what you have, and he can give you an estimate.