While my uncle was home for christmas he had the chance to show me his old Browning Sweet Sixteen Semi-Auto shotgun. The gun was in great shape and he had 2 barrels with it, one with a polychoke. He was wondering how much it could be worth since he said it was made in St. Louis, before the Browning manufacturing moved overseas (increasing the value). Does anyone have any idea on how much it could be worth, or how I could find out for him?