First of all, listing price and actual value are not usually the same. Second, it depends on the gauge and condition of the gun what the value may be. Thirdly, Parkers tend to be valued higher than other American made doubles of similar grade in a lot of cases.
Study all the for sale forums, auctions etc for a while, and try to look at completed sale prices when possible. After a while you'll become better at establishing fair market value of the various firearms you see for sale. It just takes due diligence.
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