Thanks for the kind wishes. I promise to treat this thing right.
When I first heard about it, I contacted John Folsom, who advised that it's an interesting set and well worth getting.
The CRT is stamped 15GP22 (and PAR under that, whatever PAR means).
This will be a long term project, so don't expect exciting news any time soon. Today's big achievement was unbolting it from the pallet and grunting it onto a metal table where I can start to clean it up (photo below).
The previous owner also has a B/W monitor for sale, round CRT, model MI-36052. If anyone's interested, send me a PM and I'll get you his contact info.
Phil Nelson