I think jOe's question is a good one and since I have a stake in this issue I'll give my opinion which is I have no real opinion
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I'll give a general statement that pertains to Parkers. Anytime you restore a graded Parker you reduce the value EXCEPT if the gun is in such poor original finish that it looks UGLY! The gun that I will show is a Parker AA hammer gun (I think there were 5 made) so it is a very rare gun.
The first picture is what the butt stock looked like when I received the gun (really nice huh!). The finish was so dark that the figure was not visible. the second and third pictures show the same butt stock with one addition that the client requested. The client wanted a skeleton butt plate installed. It was not an ordinary butt plate however, it was a cut-off from a Parker AA that he had.
https://imgur.com/MG9HL7nhttps://imgur.com/h09YD6ahttps://imgur.com/5dhv7Rw