Special limited edition cover to commemorate the 80th Anniversary of the Royal Air Force. Each cover has been personally signed by three highly distinguished RAF aircrew veterans from World War Two and all of whom flew on the famous "Dambuster" raid, in May 1943. Squadron Leader George Johnson DFM (observer and bomb aimer in Lancaster AJ-T) Flight Lieutenant George Chalmers DFC, DFM (wireless operator in Lancaster AJ-O) Flight Lieutenant Edward Johnson DFC (observer and bomb aimer in Lancaster AJ-N)