This is the badge of a serving brother of the Most Venerable Order of the Hospital of St John of Jerusalem. This image shows the old style of the badge for this grade, used before 1949. The image comes from my personal collection.
<a href="//commons.wikimedia.org/wiki/User:Evadb" title="User:Evadb">Evadb</a>
2008-10-20
<span class="int-own-work" lang="en">Own work</span>