On this site, there is a thread in "General Discussion" that discusses restoration by various people. The title of the thread is "LugerMan Restoration Services".
Some comments are made. I do not know the veracity of any of the comments. But since it is an open thread, I am pointing it out to you. Since you are concerned with 'restoration" as compared to "re-bluing" it may help you. If yo have any further questons, you could PM the various people who made posts and they could give you more details.
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charlie
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