Luger 1937 S/42 Information please.

[Bentonville]

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A friend has asked me to check on the value of a Luger his father brought back from Germany in 1946. His father has recently passed on and now has the problem of settling with siblings.
The gun is a polished blue with some very minor surface rust on the left side middle of the frame and some light pitting just forward of the chamber. All the numbers match except for the magazine. It has the Nazi proofs. The grips are solid with no cracking. Some darkening around the periphery. Action is extremely smooth. Finish is approximately 85%. If you can offer any insight into the value or any other aspect, please do.
The plan is to use lot of oil and some 0000 wool to lightly rub the surface rust away in order to stop it from doing it's work. Is this a good idea?
Thank you.