Thanks to Dave Sica who picked up the Admiral and handed it to me today at the Sarnoff Library in Princeton. Sure enough, it has that magic 1951 'color' connector on the rear.
Questions: Did they use a dual CBS-color/NTSC flyback? Was the connector there to add a color wheel? Was it there to convert an NTSC b&w set to display CBS color in b&w?
Here's what I found in this page just added to my site.
http://home.att.net/~pldexnis/potpou...e_Admiral.html