Herb:
I have had some experience with items (not lugers) from which I have had nickel plateing removed. Assuming that the marks/stamps on your pistol were in good shape when the plating was applied, neither the plating process nor its removal should result in harm to the markings or the metal. That assumes you use the electrochemical process to remove the plating. Using a method that employs an abrasive technique should be avoided for the reasons that you have stated. This has been my experience, in any event.
Good Luck
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