Thanks for the information. I am in Richmond, VA, so if you know of a reputable gunsmith around here, please let me know and I will have him take a look at it.

The gun does have some light rust as it was kept under a bed for years and was not oiled. It has probably been about 40 years since it was last fired and had only light use prior to that.

I am not certain what "case color" is. Is that a coloring that the steel picks up during the hardening process?

Yes, case color is the result of the heat process used to harden metal. It is easy to remove case color just through normal use of the gun. That is why its a sought after attribute when purchasing a Parker, so few Parkers have original case color today because Parkers were enjoyed in the game fields and shooting ranges and the case color was worn off.

If it has a lot of case color, look for a gunsmith that not only fixes Parkers but one that is also knowledgeable in restoration too. "Maybe" a good restoration man knows some secret that can bring it back to it original glory; but I am just guessing as this is way outside my knowledge base. It can't hurt to ask even if it can't be done, one never knows maybe it can? It also may be cost more than it would be worth.