Royal Tank Regiment 'Sept 3 1939 Gt.Britain France Poland' sweetheart brooch

A rare Second World War Royal Tank Regiment gilt and enamel sweetheart brooch, suspended from a patriotic red, white and blue bar "Sep 3 1939" "England France Poland". Very good condition, original pin fittings, no damage to the enamel.
Height 43mm.
3rd September 1939 Britain and France declared war on Germany following the invasion of Poland.