[Arran]

Because they are German people often think they are worth ridiculous amounts of money, including the floor model ones. An 8 tube model is pretty middle of the road so $100 is a little much, if it were one with 12 tubes and motorized tuning it might be a different story. I don't really find that the average German set performs any better then a typical North American AC radio of the same period, I've never seen one with a tuned amplifier stage for the AM bands or extra IF amps for the same, most of the extra tubes in there are for the FM and audio circuits. Also just like the German cars many are also a real A-hole to work on, the main Achilles heel is those piano key bandswitches which they stupidly use to turn the set on and off. If you really like it I wouldn't go over $50 for it, but I would try to get it for less.
Regards
Arran