I've done some poking around. Apparently soundscriber made disc-based office dictation machines for quite a while. They also made a 1-inch 30 track machine that NASA used to record all the mission-control conversations in the 50's thru the 70's. This particular product is monophonic, with a rotating head? That supposedly runs very slow, if it is to record for 24 hours. I guess that's why it calls for 2 inch tape, due to the extremely slow speed.
Very gnarly. You'd probably get better-sounding results from a micro-cassette recorder, though, but I wouldn't mind experimenting around with it. HELL, keep it in your studio arsenal, for whenever you MUST have that extremely LO-FI coloration.
It looks eerily similar to a Quad video transport.. in fact it probably used videotape to record on. Do you think it requires compressed air and three-phase power in order to run?