Civil Ensign of Burma (1952-1974).
<a href="//commons.wikimedia.org/wiki/User:Ericmetro" title="User:Ericmetro">Ericmetro</a>
<span class="int-own-work" lang="en">Own work</span>, source: <a rel="nofollow" class="external autonumber" href="http://fotw.fivestarflags.com/mm-old.html#civen">[1]</a>.