I live in Seattle and was a frequent customer and lurker at the speakerlab store, from the very first days in the early 70s. In those days I owned models .1, 1, 2, 3, 6, super duper7, and 30.
The super 7s in the top pics were the original versions, with the wooden slats to cover the round holes where the magnet slipped in, and walnut veneer cabs. They did not have a Nestorovic alignment, which came years later.
There was another top line version for awhile, the "Super-duper 7", that used the 350 cycle midrange horn from the K-horn, mounted on top of the woofer box, with the big EV horn tweeter. I owned a pair of those. Can you say "Rock and Roll"?
Later the walnut veneer was replaced by vinyl. Still later they used "wave aperture" horns for mids and tweeters, similar to the Klipsch tractrix geometry, vertically stacked with the 12 and 10, in a larger box. Still later they went with polypro midranges and woofers, leaf tweeters, etc., which really weren't the same speaker at all. The drivers were far cheaper than the EV and Atlas horn drivers they had been using in the classic 7 models.
They got connected with Nestorovic for the woofer section of the model 30, which was pretty good but used cheap mids and tweeters, and for the 50, which was the best speaker they ever made, and a truly great speaker, similar to the delta shown above (with glass tops, a la JBL).
The speakers you own are very cool, and a giveaway for $100. If I was local I'd be at you door, for sure.