Antarctic Treaty - 1961-1971 - 8-cent 1971 issue U.S. stamp. Enacted on June 23, 1961, the <a href="https://en.wikipedia.org/wiki/Antarctic_Treaty_System" class="extiw" title="w:Antarctic Treaty System">Antarctic Treaty</a> is the earliest of the post-World War II arms limitation agreements and provides that Antarctica shall be used for peaceful purposes only.
Bureau of Engraving and Printing. Designed by Howard Koslow.
U.S. Postal Service; National Postal Museum: <a rel="nofollow" class="external text" href="http://arago.si.edu/category_2034389.html">Antarctic Treaty Issue</a>