Hello Gordon, if they can be documented as original to the gun as it left Parker Bros. IMHO they probably add another 25% - 35% to the value of the gun. If it can be documented that the second set was made for the gun at a later date by Parker. Bros., again IMHO, then maybe they will increase the value by 15% - 20%... maybe a bit more.
It would be difficult, if even possible, to be able to document such a thing from Remington records.
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