More than unique: only small pictures even on German A: web site
In 2010 I bought on ebay a frameset with a fork, the frame seemed interesting because of the unusual suspension scheme .
Now the bicycle scheme in working order as in the photo, but not in an completely original form.
More modern brakes, they should be replaced.
A problem still a rear shock, now 165 mm., but shorter is probably necessary.
My question about the shock-absorber I was answered from "German A:": Hallo Alex,gratuliere – ein ganz besonderes Modell – war ein sehr gutes Bike und System.
Der Dämpfer ist 175 mm lang.Anbei etwas Geschichte zur Bike und German Answer.
Mit freundlichen Grüßen / Best regardsteam german:A.
But it isn't enough photos of similar bicycles according to which it is possible to make a correct restoration. Hereprobably only photos.