My grandmother gave my dad an old shotgun last month. It was her dad's shotgun and had been sitting in a closet for the last 20 years. She told us to come get it cause she didn't want it in the house anymore (she's skiddish around guns). She told him on the phone that it was a Wnichester, but when we got there we found out it was "Winchester Model 37 Redletter". He cleaned it up, refinished the stock and barrel and shot it. He was wondering how much it is worth. It's not for sale cause it's a family hierloom, he was just wondering. Does anyone have any idea what this shotgun is worth?