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Many firearms over 50 years old qualify as "Curio & Relic," and you can Google the rules and exemptions pertinent to those.
There are some gun shops that buy guns... at a price they'll make a decent profit on, or they might offer to put it on consignment and you get paid when they sell... pawn shops are another option.
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Since you are in Erie, might I suggest discussing your options for consignment with Ross at Gunsport in Boulder. They charge 20%, but do very well in getting your guns sold for an excellent price. No fuss on your part- drop them off, pick-up a check later.