(https://s19.postimg.cc/6b83rbnen/IMG_3991.jpg) (https://postimg.cc/image/6b83rbnen/)
It's a Ruby amp (LM386) on veroboard built into the enclosure of a desktop PC power supply. The speaker was salvaged from an old intercom unit, and actually doesn't sound too bad. Though a slightly larger real guitar speaker would fit, and probably sound a little better.
(https://s19.postimg.cc/k66e9c7en/IMG_3992.jpg) (https://postimg.cc/image/k66e9c7en/)
Here's the inside. I need to get some knobs on it. The speaker is wired with quick disconnects. An external speaker jack could be useful.
Excellent use of a repurposed enclosure!