The "A" can vary in size...I have a matched pair - original to a 5 Bde HQ Sgt's tunic (got a fair idea just who he was as there were only ever six substantive-ranked Sgts in the 5th Bde HQ and just one of those had four overseas years of service, starting in 1915 ) - two other examples of differing sizes, in gilding metal, and a further single one that is in an oxidised finish...(8{
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