MuntzTV Roundie ad from 1969...

[bgadow]

I can probably put my hands on the Sams, but not tonight. I do remember, a couple years ago, somebody having a 60s Muntz color set with a 23v tube. I guess it's possible the pictured set was a rectangular model-they just list the size in square inches; I don't want to think hard enough to figure it out from that! Hard to tell much from an illustration like that.