Don't see many of these:

[Ponyman]

If that's an adjustable rear sight, I'd remove the barrel weight and call it the most beautiful Luger I've ever seen..... Arty and Navy had elevation adjustment, but this one might have windage.

Interesting that the prototype is called number "08" - there's no grip safety, but it has dished toggles.

RK, can you get any more pics???

Does anyone have more info about the referenced Sport Model series???