I think if it plays ok, you should try bargain them down but take it home. Chances are the top and sides are solid (although Japanese adverts often leave out the less desirable features, I think they pretty much would only have made solid tops back then - I'd be pretty confident that they would be solid as opposed to the laminated woods used in cheaper guitars). In addition the guitar should have aged nicely and come into its tone. Plus the headstock is just really cool.
So if it plays nicely and doesn't have huge cracks and stuff, I'm guessing it'll be a great guitar well worth the cash (almost certainly in a whole other world of quality for anything you could get for close to that amount new). I'm sure the guitar pictured above is the same. Japanese makers tended (still do) to name guitars after the selling price. As the price goes up, the model number changes. Note that the fret markers, the pickguard, and the headstock all look identical.
