Saw this “for pickup” on the sidewalk recently.
I can’t imagine who would use something like this, but it was pretty high-end in its time!
This is as old as me! The style then was to “embed” these into large cabinets (I’m guessing), hence the simulated woodgrain.
Here is a view of the connections at the back, which really show its vintage (“look, it’s stereo! you can even turn the left and right speakers on and off!”)
Here is a 1985 newspaper advertisement for it (link courtesy Wikipedia).