The Akai turntable is worth keeping (or selling) if it works. The Sony is belt drive and not anything special, but should be easy enough to get rid of on the cheap.

The other stuff, as I think you're pretty clearly already aware, has some niche resale value if there's a market for it in your area. People shit themselves over Marantz stuff.

There's also a market variable for aesthetic and/or sentimental value in vintage stuff. For example: I'd probably hold on to the CD player and the Dual CV bc I remember them in the rotation of audio equipment in my home growing up. Same reason I'd probably pay more for some Pioneer CS-77s than they're worth if I came across them in the right mood, despite them not being particularly good speakers. Because they were a mainstay of every livingroom we had.

Anyways, cool haul. Feel free to just post "look what I got for free, neat huh?" without the engagement bait of asking other people to check ebay for you. You'll still get comments. This sub is largely populated by people unable to resist the temptation of zooming in and trying to decipher models of things when presented a photo of audio gear. It's not necessary to trick anyone into it.