What is your Benjamin Franklin air rifle 137 caliber 177 worth?

The model 137 is part of a series of Benjamin pistols (130, 132, & 137) made between 1946-1985. My information states that its a pistol not a rifle. If you have a Benjamin 137 rifle then I have no information for you. Also please state the condition of the Pistol to get an estimate of value. (Benjamin did make a model 317, that is a rifle.)