I am a member of the Texas Antique Radio Club. One of our members has written an article about these and other Texas radios.
See:
http://www.gvtc.com/~edengel/TexRad.htm
At one of our meetings, a member brought one of the prototypes for this. It was in a pretty rough made case.
They did not make many of these, this is possibly why it is missing from the antique radio lists.