Someone might find this useful...
 

An ebay auction...with several old knobs AND what looks like an RCA nameplate for one of their CT_100 sets? Also a Zenith spotlite dial knob..


http://www.ebay.com/itm/6-TV-Knobs-D...cAAOSwwPhWkJk6

I saw that, it could be a CT-100 pencil box but more likely from a B&W set.

http://www.earlytelevision.org/Deksn...x_text_jpg.jpg

http://i.ebayimg.com/images/g/pz0AAO...k2/s-l1600.jpg

They're the same physical size, you just have to drill added holes. Done it :)

Odd, I do not see labels for the controls in that RCA box. I got a "spare" control box with my CT-100 that looks the same from outside but has a different control set, for a B&W 1954 set as Eric said.