American Circus 5-cent 1966 issue U.S. stamp. Issued to honor the American Circus on the centenary of the birth of <a href="https://en.wikipedia.org/wiki/John_Ringling" class="extiw" title="w:John Ringling">John Ringling</a>.
Bureau of Engraving and Printing. Designed by Edward Klauck.
U.S. Postal Service; National Postal Museum: <a rel="nofollow" class="external text" href="http://arago.si.edu/category_2034187.html">American Circus Issue</a>