At the Denver Tri-State swap meet, I saw a radio with the single speaker in part of the same housing, that looked to me like an original AD truck radio. The AM radio was HUGE. Probably was quite compact for the tube technology of the day.
I asked if it worked, and they told me that for $5, I could find out.
...I didn't buy it because I can't imagine trying to find the tubes for that thing anymore. I think maybe I should have, just because of the curiosity factor. I mean, what if the darn thing did actually work?
The Wonderbar AM/FM monofield radio in my '68 Corvette worked after I did some minor rewiring. I keep it in the car as a curiosity. But it's really only good for listening to the news.