John, I'm not sure I understand the reference to double stamping, but your gun looks like a sound, well used trojan -- and an early one. Except for the rib extension, I did not see anything extraordinary or especially unique, but it looks like the screws are good and generally timed, and that the finish -- well worn -- appears original. It's looks like a nice gun, and since it's a 20 gauge, more desirable. I'd sure advise membership as the next step for you...and then get a letter on the gun if you want something to support an insurance policy. If you check the various double gun sales websites -- I'd recommend "guns international" as a good place to start -- you can begin to see what people are asking for Parker's lowest grade gun in similar condition. There are still lots of things about your gun that can only be determined with the gun in hand.
It's a very nice gun, and a family heirloom. Enjoy it!
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"Doubtless the good Lord could have made a better game bird than bobwhite, and better country to hunt him in...but equally doubtless, he never did." -- Guy de la Valdene (from A Handful of Feathers )
"'I promise you,' he said, 'on my word of honor, I won't die on the opening of the bird season.'" -- Robert Ruark (from The Old Man and the Boy)
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