An update; I wrote an article for ARC on this Zenith....
www.antiqueradio.com/Sept_Hayden_Zenith.html
I've been asking a lot of people about this set, including overseas Zenith collectors, no one seems to know anything about it, just the two people I mentionin the article who recalled seeing one many years ago.
I like havng a scarce, if not rare Zenith which only cost me $30. ! It's a great addition to my postwar Zenith collection.