Canal Zone, 1957 75th anniversary of Gorgas Hospital Issue, 3c
<p>Bureau of Engraving and Printing
</p>
Image obtained from eBay <a rel="nofollow" class="external text" href="https://www.ebay.com/itm/253617529543?item=253617529543">eBay item 253617529543</a>
U.S. government / Canal Zone Postal Authority