...or any pistol...
I viewed a pistol this last weekend that had been buffed and reblued, but the seller insisted it was original...
So for those that are unsure, here are some signs to look for...in a Luger...
These are two commercial Lugers, and the biggest tipoff is the smoothed edges and high gloss...Look at a specific area on each pistol, and compare them...
I look for buffing; a pistol that has been "dipped" (blued without buffing) is a bit harder to recognize...