OK, it's not THAT much like a Regency TR-1, but there are some similarities. Maybe you can help me figure out what I've got here. If I had the tuning knob, I might know more than I do, but then maybe not. This appears to be a commercially-made transistor radio, possibly a kit. It's 3 inches by 5 inches. The cabinet is a painted fiberglass or similar material. The board inside is made of this same material, unpainted, and is not a printed circuit. There are a couple of electrolytic capacitors with the name "Selkar" on them. The R/C tuning cap is dated mid-September, 1954, but of course that only tells us when the cap was made, not necessarily the radio.  The sockets that (I assume) contained transistors are empty. Similarities to the Regency TR-1, the world's first commercial transistor radio, include the size, the tuning cap, and the Jensen speaker.

It's nice to have a mystery in my collection, but it's nice to learn too. So if you know anything about this mystery radio, let me know. If not, well then just enjoy the mystery!