skitch,
A few pics of the gh would help too. No one can give you a value on the gh as you've described it. What's the frame size, gauge, barrel length, condition of bores, bore size, choke, originality, approx. stock dimensions, tight/loose/on face etc., etc., etc. An original GH that doesn't require work before use can cost anywhere between $750 to $5,000.

"I hate rude behavior in a man. I won't tolerate it" - Capt. Woodrow Call