Actually, Phil's site is what finally made up my mind to track one of these things down. I'd known of them for quite some time, but the sound of the restored instrument just captivated me.
Here's the kicker. I am going to have to spend a lot of time researching it, but from what I know so far, the previous owner probably acquired it from CBS in the mid-seventies, where he worked for years. If so, it MIGHT be the one that was used for episodes of "The Twilight Zone" and many other historic programs. Like I said, I need to research this and with any luck won't find dead ends at every turn and I only have a vague suspicion with precious little evidence at this time, but on the other hand, I so far have no refuting evidence. It will be a fascinating project.