Looks refinished to me; maybe walnut shell or corncob blasted. Very light buffing, quite well done. The plum colors would be a confirmation of re-bluing to me, but again, well done. No holster wear on sideplate or handling wear on grip straps, again an indication of refinish. Grips look new (repros). Plum colors maybe from poor heating of bluing solution/poor circulation.
It's at $1425 right now, another day to go. I'd say the complete 'rig' would not lose you any money at this price. I like it, and again
at this price, I wouldn't hesitate to recommend it.
A good "starter" Luger.
Hehe...Ask for more pictures...