Tim:
I've been reasearching the Klemm. The razor back is in fact the first version. An original with that same scheme is hanging in some airport or museum in Germany. There are lots of versions primarily because of different engines being used and the different tail configurations. I'll see if I can give you the links I found.
Jim
[link]http://www.luftarchiv.de/index.htm?
http://www.luftarchiv.de/flugzeuge/klemm/kl25.htm[/link]
[link]http://www.preservedaxisaircraft.com/Luftwaffe/klemm/kl25.htm[/link]
[link]http://www.meineflieger.de/klemml21-l27.htm[/link]