Thanks for following-up, WMcD -
Starting to get optimistic over here based on your observations/insight coupled with the 1963 price list. The photo of the Klipschorn Style "D" Decorator's Model found on the bottom of page one looks amazingly similar. Reading fine print on the very bottom left of the page, it clearly states "Exotic woods and finishes on bid (submit sample for estimate) is helping as well.
There is an encyclopedia-sized plywood inspection / access cover on the speaker's base cabinet right hand side where I imagine a woofer can be found. It hasn't been removed - probably since it was originally installed so I can't help you there.
As far as provenance - I can't tell you much other than it has been sitting in in dry storage for a very long time. I've been given the opportunity to purchase this single speaker "as-is where-is". It's not cheap and I can't test it for obvious reasons. I know nothing more which is why I'm reaching out to this forum.
I was really hoping that someone could tell me if it was indeed a Klipsch product and whether there was even a remote possibility of finding a mate. It's been an orphan too long.
Finally yes. My Grandmother used to call me that when I got on her nerves - fairly often, many moons ago.
Kind regards.