Formation sign of the Northern Ireland military District post WW2, King's Crown variant. The harp is the design worn by the Royal Irish Rifles as a cap badge. Worn from 1948 to 1953, when the crown changed to the queen's crown type.
Badges on Battledress, Post-War Formation Signs; Rank and Regimental Insignia, 1953, Gale and Polden, Aldershot, no ISBN.
Cole, Howard, N