I know this is an old thread, but stumbled here and had to post.
I currently own a set of these and they have been in active service since my parents bought them in the 80s. My dad got them with a pretty decent (again, at the time) Marantz receiver that succumbed to the ravages of time long ago. I inherited them circa 1995 after they sat for about a year. I rebuilt them around that time as the foam surrounds were rotted. Used a newer foam material that has held up very well and tightened up the sound a bit. Quite fond of the sound on these even now, though on paper they are probably outclassed by modern components in many ways, they still have lived through many amps and receivers, including anchoring my current surround setup as primary left and right. (Sony STR-DN1080, running 5.1.2) They have always had a very nice balance to highs and lows, very clean. I'll be moving them to my garage setup later this year and putting something a bit more responsive as my mains, but I will never get rid of them.
They have traveled from the I-5 corridor in Washington, through Idaho, and into many homes in Montana. The veneer is rather rough now, and they are no longer the lookers they once were, but they still pump out good sound and say "thank you sir, may I have another?" every time. My dad was never one to buy top-of-the-line for much of anything, and I'm sure he felt "suckered" into buying that sound system back then. (it couldn't have been cheap, especially for him) But it always puts a smile on my face to think of how much "value" he would have seen in them now, with how long they've served. I have enjoyed them over the years so much.
Did some searching in the 90s and early 00s but never could find definitive proof on where they came from. Frankly, I gave up after finding odd mentions of different buy-outs or other (apparently) erroneous data, so thank you so much for this information! This thread is also the first time I've actually seen pics of the exact setup. The grills do come off, as shown in my linked image above, but they are difficult and fragile.