Lot 8081-11:   Aircraft Recognition Tests, 1943. “Only One Of These Is The Catalina”.  Answer:  PBY “Catalina” Patrol Bomber is on top; with the “Mavis” Type 97 Patrol Bomber underneath.  Note the single fin and rudder on the PBY.  Bureau of Naval Personnel.  Courtesy of the Library of Congress (2016/04/29).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
2016-04-29 09:28
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/127906254@N06/26649795871/">Lot 8081-11</a>