RAF / Air Ministry recognition cards, Green pack, July 1941. Marked 'For Official Use Only'. A 'key' sheet showed various silhouettes of allied and enemy aircraft to be memorised. The pack of cards was then used to test recognition of these aircraft. Normally issued in boxes of four individual packs - each pack colour coded (Red, Blue, Green and Orange). Several different sets were produced during the war - this pack dating from 1941. This pack features miscellaneous aircraft and includes fighters, bombers and transport aircraft. Full set of 52 cards plus 'joker'. The cards are in very good condition but the box shows age related soiling. The key sheet is missing. Stock code P19781.