330-PSA-399-60 (164708AC):  Nuclear weapon “Fat Man” type, the kind that detonated over Nagasaki, Japan, on August 9, 1945.  The bomb is 60 inches in diameter and 128 inches long.  The second nuclear weapon to be detonated, it weighed about 10,000 pounds and had a yield equivalent to approximately 20,000 tons of high explosives.   Photograph courtesy of Los Alamos Scientific Laboratory.   Photograph released December 1960.  (9/15/15).
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/127906254@N06">National Museum of the U.S. Navy</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/127906254@N06/21473099951/">330-PSA-399-60 (164708AC)</a>