King's Crown version of Royal Observer Corps Ensign.
Own work, based upon images at <a rel="nofollow" class="external text" href="http://www.crwflags.com/fotw/flags/gb%5Eroc.html">CRW Flags</a> and <a rel="nofollow" class="external text" href="http://www.rocassoc.org.uk/open/national/roca/hist_ng2.htm">Chronological history of the  ROYAL OBSERVER CORPS</a>.
<a href="https://en.wikipedia.org/wiki/User:Wally_Wiglet" class="extiw" title="wikipedia:User:Wally Wiglet">Wally Wiglet</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
15 September 2011 (original upload date)
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons.