Canal Zone, Dredge cascades, 13c, 1976 Issue
U.S. Bureau of Engraving and Printing
<p>U.S. Government: Canal Zone Postal Authority<br></p>
Image obtained from eBay :  <a rel="nofollow" class="external text" href="https://www.ebay.com/itm/253608266760?item=253608266760">eBay item 253608266760</a>