@chorus I did not own these but heard them once. I stopped in to a local shop on a Saturday morning and these speakers had a substantial audience. We were all just amazed at what we heard. Consensus in the room was that this was by far the best speaker any of us had heard. But that was then, and speakers have come a long way since the early 90's.
They are old. If I were you, I'd try to find out what the crossover design looked like and get an estimate on a rebuild before buying. Plan on rebuilding, regardless of how the speakers audition. Crossovers that old are not going to be functioning in spec. They just aren't.
200 lb speakers are a pain to move and a pain to sell. You better be sure you can live with them before you buy.
I've been down the nostalgia road. I had fun reworking a pair of A/D/S 1290's from the mid 80's. It was lots of fun and I enjoyed the work and learned a lot, but I probably won't go down that road again.
Keep us informed. I love to follow stuff like this.