Hi Ivo,
These photos of the Spin (I thought in German it was spelt Spinne) are absolutely magnificent! Thank you very much for posting them!
Is it an original aeroplane? It looks old, and it looks as though it is original to me. Where is it displayed? Do you know if there are drawings available for it? WW1 aeroplanes are difficult enough to obtain drawings of. This one, which is presumably pre WW1, or very early WW1 at the latest would be almost impossible to obtain drawings for, I would imagine. I am not particularly familiar with the Argus engine, but I can see what appears to be an Argus badge on the front of the engine.
Regards,
David.