Ha - thanks, that's very kind! ;-)
looks like a nice project bike but needs for sure a full restoration. Seller says he considers serious offers - what ever that means...
I would assume that a bike like that with papers (he says it has them) and full MOTed/TÜVed would sell here for somewhere between 12.000 and 15.000€. Now consider a complete engine rebuild, carb rebuild, new wiring, new tires, new paint, the transport and MOT, some missing parts, Brake restoration, new papers etc., which easily sum up to 10.000€ or more and you have what it would be worth in the current state, at least to me. I don't think he's gonna sell it below 5.000 though, but I might be wrong.