It is probably going to be a tough pull to get an answer along the lines of "that is the power supply for the XXX model transceiver". WRL made power supplies for their own gear as well as supplies for other companies gear that they sold. For example my Multi-Elmac Trans-Citer AF-67 has a WRL supply that looks just like that, even has a very similar if not identical connector.
Without knowing what voltage is on what pin, and what the voltages themselves are it will be tough to narrow down. I have seen those supplies hooked to Heathkit, Multi-Elmac, WRL, Drake, National, etc, etc gear. And even then, one supply might work with many different models or even different brands.
T!
