I don't think there is anything wrong with restoring a luger that in this condition. I see it as reconditioning or preserving a piece of history.
If a Luger is in bad condition, do to indifferent neglect, and can be restored. I believe it should be. Nothing is gained by leaving it alone. And I do believe that something is definitely lost in doing so.
On the other hand, if the pistol is in good condition (80%+) and just shows honest use and has been cared for. I feel that light wear or patina is part of that history. And should be left as is. And should'nt be restored or refinished. Just because the owner wants a pretty gun.
This is a 1914 DWM that I bought a year ago. It has been neglected over the years. And needed to be preserved.
It has been in the hands of Ted Green for awhile. Can't wait to see it.
Ron