I just got hold of what appears to be an unnumbered and possibly unused Krieghoff frame, and you can see what it looks like in this thread:
http://forum.lugerforum.com/showthread.php?t=31292
I was planning to use it for a shooter project, but I would rather sell or trade with someone who appreciates it for what it is. I would like to offer it to the members before it goes on Gunbroker, but I don't have a clue what the value could be and I can't advertise it here without a hard number. So what do you think a fair price would be?