[Arran]

If the cabinet isn't too bad, then anywhere between $50 and $100 is reasonable, more if the finish is really nice, and the set is all complete with good major parts. But I would see how much lower then $85 you can get, these are fairly complex radios, roughly equivalent to a Philco 116, but they often have rubber/gutta percha covered wire, and the power transformers have been known to fail sometimes. On that last point I would bring a multimeter with you and check the transformer windings, you can do this at the rectifier tube socket. Even if you want to gamble it is a set well worth restoring, even if you had to replace that, but if it is shot then you can negotiate more off the price, they always need more then just a power cord, or a tube, always.
Regards
Arran