Pete,
The first two CT-100's listed on your site's known CT-100 list are 'B111' numbered sets. One in Conn. and one in N.Y. These could have been owned by CBS because of their proximity to CBS, New York. There is also the well documented 1955 era picture of a CT-100 located at the CBS transmitter at the Empire State Bldg. Makes sense, CBS may have used readily available CT-100's early on, as studio monitors and in engineer's and executive's homes to evaluate CBS color broadcasts in 1954-55 Perhaps these 'B111' sets, as you suggest, were a special order batch wth minor modifications for CBS. Are there other 'B111' sets known to you and not listed?
Pete's CT-100 Known Serial Number List:
http://home.att.net/~pldexnis/input/..._pub_list.html
-Steve D.