M41 of South Vietnamese Army advances of enemy positions in Saigon. - Vietnam May 1960.
Starry, Donn A. Mounted combat in Vietnam. DEPARTMENT OF THE ARMY
1960-05
<a rel="nofollow" class="external text" href="http://www.army.mil/cmh/books/Vietnam/mounted/images-full/F20.jpg">US Army</a> "M41 OF SOUTH VIETNAMESE ARMY ADVANCES ON ENEMY POSITIONS IN SAIGON, MAY 1960" <i>Tanks at War</i>, <a href="//commons.wikimedia.org/wiki/Special:BookSources/1-85605-342-3" title="Special:BookSources/1-85605-342-3">ISBN 1-85605-342-3</a> claims it to be during 1958.