It's Post 53 having a Queens crown , usually military buttons are marked . Especially British and other large military forces .
these are HM customs and excise buttons.
"…knowing him, and something of his deeds, it was impossible not to believe in greatness. In that square figure was housed a spirit of grandeur, and with his massive heroism went gentleness and modesty, even humility. He had no need to proclaim his virtue, for history would be his spokesman."
Eric Linklater on Wavell.
spot on. thanks for both your replies