Allied Nations 2-cent 1943 issue U.S. stamp. The inscription "Nations United for Victory" is prescient of the formation of the United Nations two years later.
Bureau of Engraving and Printing.
U.S. Postal Service; National Postal Museum: <a rel="nofollow" class="external text" href="http://arago.si.edu/category_2028717.html">Allied Nations Issue</a>