Tandem 8sp cassette hubs, large flange 40h with fitting for drag brake. 145mm rear spacing. Have been built and used but not a lot. £300 posted.
I’m scrapping my Santana, will have more tandem parts for sale soon.
That's not 1st-gen, and the rear triangle should be chrome. I sold one recently - https://www.retrobike.co.uk/threads/1991-fisher-cr-7.492796/
1st-gen was 1988 and had a 1" steerer & chainstay roller brake. The oversized "Evolution" started in 1989.
Nobody buys one of these for the frame :)
If it was local I'd maybe take it for the fairly decent XT cranks/rings/pedals but it's two hours each way so meh.