Balloon and airship, world, approximate 1963 - 2001, neat inventory with more then 130 covers and cards, all suitably on the subject of, as well Austria airship post the Pro Juventute no. 1 - 9, 11 - 29 ( without no. 23 ) complete, special - balloon mail ex no. 13 - 49, balloon mail flight ex no. 29 - 39, balloon mail ex no. 30 - 53, various cachet cancel, and so on