Centrex RK-888
Here we have a Centrex RK-888, made by Pioneer in 1976. It's a mono AM/FM cassette with 2-way speakers (a 16cm woofer and a 4.2cm tweeter). Considering that it's "just" a mono, it has a very impressive feature set. More features than most stereo boxes, in fact. And the buttons and switches are pleasant to use. It takes eight D-cells, which is more than usual for a mono. The output power is 2 watts at 0.5% distortion, and 3.3 watts "max".