I have the same model. It was over 30 years in storage and worked fine before that - now of course the old rechargeable batteries (NiCad) are dead. Other than that it's in reasonable shape and comes with an old RC unit, receiver and two servos (all by Robbe).
https://plus.google.com/photos/101185498320939262991/albums/6118254355784065553
If any enthusiast wants to beathe life into it again, I am willing to let it go for a reasonable price.
Please contact me at Frank (at) Berauer (dot) org