It sounds like you have a PH model 12 ga Parker shotgun with Parker Special Steel barrels on a 1 1/2 frame. Pictures might help to make the comment on whether it should be restored.
But I think a good clean up and some selective refinishing may be more practical. A full restoration to factory fit and finish will cost you about 4 times what you've got in it. You do not mention the barrel length but I assume it is 30 inches. If the chokes are very tight you could have them professionally opened a bit but a combination of full and imp cyl would be nice and wouldn't affect the value as bad as Skeet chokes would. If the gun is tight and the stock solid $600 was a fair price.
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