ARRL Radiogram delivery form postcard (both sides).
The <a href="https://en.wikipedia.org/wiki/American_Radio_Relay_League" class="extiw" title="w:American Radio Relay League">American Radio Relay League</a> (<a rel="nofollow" class="external text" href="https://www.flickr.com/people/26137102@N08">g7ahn</a>)
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/26137102@N08/8317557091">ARRL Radiogram</a>