Austria
![Austria 1955](/image/37782/base250X250/austria-1955-14-ballonpost-erstmals-im-freien-oesterreich-salzburg-29-10-1954.jpg)
Austria, Michel 870, Cover
1955. 14. BALLONPOST ERSTMALS IM FREIEN ÖSTERREICH SALZBURG 29.10.1954. + WIEN 101 3. BUNDESKONGRESS WIEN 18.-22.10. 1955 18.10.1955.
![Austria 1955](/image/38014/base250X250/austria-1955-13-ballonpost-wien-ballon-zurich-10-4-1955.jpg)
Austria, Michel 912, cancelled post card with stamp
1955. 13. BALLONPOST. WIEN BALLON ZÜRICH 10.4.1955.
![Austria 1985](/image/38180/base250X250/austria-1985-30-sonder-ballonpostflug.jpg)
Austria, Michel 1801, cancelled post card with stamp
1985. 30. SONDER-BALLONPOSTFLUG.
![Austria 1955](/image/38017/base250X250/austria-1955-13-ballonpost-wien-ballon-zurich-10-4-1955.jpg)
Austria, Michel 873, cancelled postal stationay
1955. 13. BALLONPOST. WIEN BALLON ZÜRICH 10.4.1955.