David, please accept the opinions of the real "experts" on this site. The buttstock is not original or if it is, it's been so highly modified so as to not look like anything Parker made. The forend is probably original judging by the age of the wood on the underside. A grade 0 gun would not have had checkering. Also, most of these guns in that serial number range had straight stocks. One last picture of the trigger guard tang with the serial number may help to find out if it was a pistol grip originally.
If you order a research letter, it will not answer any of your questions. All you will find out is the gauge, barrel steel, barrel length, and weight. You know most of these things already.
Most here don't like to place a value on guns but your gun isn't worth much. If it were mine and it's a heirloom handed down from my great grandfather, I'd want to keep it in honor of his memory.
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