This is either kind of cool or a dud but it looks like it might have been sold as a build your own player. Seems like it would have been pretty cool to put your own player together although this looks like is on the low side of fidelity. https://www.ebay.com/itm/Vintage-Wa...d=391962834042&_trksid=p2047675.c100005.m1851
I'm on the fence, it's really cool but you might be right about the manual, it looks like there's some through holes on the circuit board and that bag of wires to solder. Not like a modern kit that would have everything plug in. The thing is I'd probably just put it on the wall to look at, kind of like the artist's prints I posted but a real 3-d version.