Nice find Phil. I recall they were an RCA TM-10A model. Great it has a good CRT.
http://nrcdxas.org/articles/tm10a/
When I worked at KTLA-TV in the 70's, they finally cleaned out the tech equipment storage locker. 2 of these TM-10A's were up for grabs. All you had to do is stick your name on it and it was yours. I missed grabbing the unclaimed one by 10 seconds. Both of these had the full the metal cabinet on them. They were low use and out of service for probably 20 years. A few years later I did score a working CT-100 from the KTLA chief engineer's home for $100.
-Steve D.