I don't see "prototype" - looks like a very production Scirocco in poverty spec Beech Countryman stock, damaged, and which some numpty has actually stained. I would not pay £120 for that. In fact I'd not pay anything for it, only use is as a field gun to leave knocking around.

It's true that early Sciroccos rarely come up for sale, but they are now very old, and many must have met their maker because unlike springers, which just keep going, an inevitable leak will make them completely non-functional till repaired so I guess they may tend to get abandoned when that happens, left to rust in peace, just simply forgotten about.