This looks like a fun instrument to play.
 
fretless Hohner

Interesting , check out how high the bridge is set at.

The nut appears to be at an excessively high setting also.

Maybe it's set up for slide! :-)

Very cool bass despite the string height issues. Probably could be adjusted with no problem.  
Oh if I only had the cash!

Slide ? Perhaps then some kind of open tuning as well ?
 
? {!LOL!} ?   ?__________________?

Look how far the Bass (neck ) position sticks up . I remember having played one of these in a pawn shop many Moons ago and   something that I noticed was at how high the  dimension  are at the point where the neck meets the body .  There is also something that I  noticed  as to how the union between the neck and body was made .  The back of the Bass needs to be seen !  I think there may be  a reason that the set up is as it appears ;  perhaps it would be wise for a prospective purchaser to inquire  about this issue .

The relative dimensions must be more similar to a standup than most other electric basses.
 It would be nice to see some pictures of the action at the end of the fingerboard. Considering there is a zero fret I'm guessing the action at the nut is properly low.

I think that  might be an accurate  comparison.