Benjamin Franklin 177 air rifle

Hi! I have a Benjamin Franklin .177 cal air rifle.
I can provide pics...please email me at shazmazster@aol.com for pics. I was wanting to know how old it is, and what it is worth to a collector. Not perfect condition, barrel is not rusted, wood part has alot of scratches on it, looks like it might be missing a bolt to hold the pump mechenism in place. Any info at all will be helpful. TIA.