A 3in/50 (7.6 cm) Mk 33 twin mount on the U.S. Navy aircraft carrier USS <i>Ticonderoga</i> (CVA-14).
USN
U.S. Navy photo <a rel="nofollow" class="external autonumber" href="http://www.navysite.de/cruisebooks/cv14-57/129.htm">[1]</a> from the <a rel="nofollow" class="external text" href="http://www.navysite.de/cruisebooks/cv14-57/index_012.htm">USS <i>Ticonderoga</i> (CVA-14) 1957 cruise book</a> available at <a rel="nofollow" class="external text" href="http://navysite.de/cruisebooks/index.html">Navysite.de</a>