Looking to the left-hand corner (port side of the boat) of the radio man's desk, on subchaser SC 299.
This image shows the transmitting key. Mike Schultz notes that this could be one of several different models, such as the SC-144 key, shown on this page, made at the Boston Navy Yard.
Photograph of submarine chaser SC 299 radio room, from the collection of Robert DeBow, whose uncle served on this chaser. Image courtesy of Russ Lloyd.