What a great thread. That was the Cave I wanted to own some day. How did the optics turn out? Hope your hearing improved.
If you Google "ELLI BUK COLLECTION DAY" you will find 4 days of auctions by Grogan & Company and a listing for every imaginable sort of retro gizmo. It's odd to think of this simple, functional device living in Manhattan among that menagerie. Here is Don Trombino's obit..