The Rune is an eye catcher...
If available for purchase, you would need to see and ride this one. Since the owner has had it so long... even though out in the weather, you may not get a great deal like you think.
Owner does not want to let it go unless of course you have an offer he can't refuse. You have to consider the internal damage as well as the climate effect and if you're willing to make the effort to restore it. Go look at some others first and then decide.
I would not be that guy! I like my Rune-want-a-be.