Hello Paul,
A Luger Forum member, named Herb Keister, has had success with having a plating job removed from a luger (or maybe two...). I think he found a plating shop that can do the reversal process...
If you find a decent original finish underneath, you might have gained value in your pistol. If it's real doggy underneath the chrome/nickle, you could consider having it re-done, professionally.
There is an artist listed in the Resources & links section of the Luger Forum, named "Thor"...(i.e. Ted Green)
If you want to get in touch with Herb, send me an e-mail at "pebbink@pacbell.net" and I will be happy to pass on Herb's home e-mail address to you and you guys can chat about this issue in detail.
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />