My local hock shop has a '71 Karabiner for $650. It is a beautiful looking rifle, however, someone "refinished" it with a glossy wood finish, blued the bolt, etc. It is an original equipment rifle with all matching number for the parts I have seen on it, but the metal and wood are refinished with materials and techniques not found on the originals. I love the look of the full stocked carbines, but this one just looks wrong. Definitely not worth the asking price.
Mine started as a full Karabiner, but someone sporterized it before I laid eyes on it. All I did to it was clean it up, keeping the original finishes and patinas it has aquired over almost a century and a half.