A radio premium, a 1949 Captain Midnight Key-O-Matic Code-O-Graph, the last of several cryptological premiums offered on the Captain Midnight radio serial.
<a href="https://en.wikipedia.org/wiki/User:Squadron4959" class="extiw" title="wikipedia:User:Squadron4959">Squadron4959</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
19 December 2007 (original upload date)
The image is of a premium in my collection, and I have uploaded it so that it can be used as an illustration.