It was amended to add a crest on 18 May 1965.

It was amended to add a crest on 1 July 1965.

It was amended to add a crest on 23 June 1965.

It was amended to add the crest on 5 June 1936.

It was amended to add a crest on 22 April 1966.

It was amended to add a motto on 8 March 1988.

It was amended to add the crest on 30 March 1966.

It was amended to add a crest on 10 May 1967.

It was amended to add the motto on 16 June 1928.

It was amended to add a crest on 12 March 1965.