My own Model 5 story, and perhaps it's just been wishful thinking all these years, is found on an "About Me" page elsewhere on this site. It is reproduced here for convenience.
...after high school I attended two different technical schools for the next three years. Temple University in Philadelphia had a technical institute that taught electronics using examples from the many varied circuit functions found in television sets of the fifties. About the time I was halfway through, they shifted their emphasis from the television set to -- well, it wasn't so much TO something as it was away from television circuits. So I never made that 'senior' course in color TV. The administration had shut it down and I never got my hands on the seven or so RCA-supplied CT-100 sets the school had used in the lab-part of the course. They had been supplied to the school years before by RCA at Camden, just across the Delaware River from Philadelphia. [
I often wonder if they weren't some of the 200 or so model 5s built for the first NTSC color network broadcast of the 1954 Rose Bowl parade. I once spoke to the lab tech about them; it was after the course had been eliminated and the unused sets sat in a cage gathering dust. He told me then that they were not "standard" sets and that RCA did not want them back.
Any Temple U. faculty, administration, or students around who can confirm, refute, or add to my speculation?