Hector Merchant - 176008 Royal airforce - though perhaps someone could help narrow down a window of when etc. ? All the best, Rm. Edit - from fb... The RAF was formed in April 1918 from an amalgamation of the RNAS and the RFC during the last year of WW1...... Although new uniforms were introduced, these were still very much khaki-based and were very sporadically obtained or issued. Many personnel of the new formation continued to wear their previous existing uniforms with and without a change to the insignia for the duration of the war and into the post-war period...... Below - the "new" style headdress introduced for the RAF in 1918...........image shows a RAF Officers cap with the additional bars to indicate rank (soon discontinued).... "Restored by Francisco Moll"