Balloon and Air ship postal service, Europe, 1963 - 2001, clean treasure trove with approximate 80 covers and cards, all suitably on the subject of, as well including Austria airship post the Pro Juventute no. 1-9, 11-22, 24-29, always 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.