The "coeur noire" ("black heart") was the personal insignia of French WWI ace Charles Nungesser.  NASM A-32949-A. National Air and Space Museum Archives.
National Air and Space Museum Archives
<a rel="nofollow" class="external free" href="http://smithsonian143.rssing.com/chan-6135340/all_p6.html">http://smithsonian143.rssing.com/chan-6135340/all_p6.html</a>