And 80% bluing is a lot of bluing gone from the gun in addition to the scattered freckling.
I'd go to see, but the starting bid, usually doesn't start there unless there are silly people at the auction, or there is a previous written auction(non-present bidder).
So, it all depends on how many people get excited, but as my friend Dwight is guessing, people get excited at seeing a "valuable" Luger up for auction...
Of course, I wouldn't mind getting a 1913 Erfurt, but you can always find a good price if you look long enough.
Ed