Long before boomboxes and rack stereo systems , companies like Soundesign made stereos for the less afluent masses. They allowed people to afford a stereo - usually a combo receiver, turntable, and an 8-track or cassette (sometimes both!) Back in the 70s, a modest component stereo with receiver, turntable, and speakers was $500. Soundesign made all-in-one units for $80 - $200. I don't know who actually manufactured them, but most of their early 70s units were made in Japan. By the mid 70s, they'd moved into Hong Kong and Tawain. When rack system became the rage in the early 80s, Soundesign made rack-looking all-in-one systems.
If I were you, I'd clean it up and use it. I think stuff like that is cool.