Balloon
Austria, Michel 1909, Cover
1988. 79. BALLONPOST.
Austria, cancelled post card with stamp
1991. 86. BALLONPOST.
Austria, Michel 1185, Cover
1965. 7. SONDER-BALLONPOSTFLUG.
Austria, Michel 1685, cancelled post card with stamp
1982. 25. SONDER-BALLONPOSTFLUG.
Austria, cancelled post card with stamp
1987. 77. BALLONPOSTFLUG.
Austria, Michel 1129, Cover
1963. 29. BALLONPOST.
Austria, cancelled postal stationay
1984. 72. BALLONPOST.
Austria, Michel 1084, Cover
1961. 25. BALLONPOST. SALZBURG 11. MAI 1961.
Austria, cancelled post card with stamp
1988. 80. BALLONPOST.
Austria, cancelled post card with stamp
1985. 30. SONDER-BALLONPOSTFLUG.
Austria, cancelled post card with stamp
1981. 66. BALLONPOST.
Austria, Cover
1980. 22. SONDER-BALLONPOST. 1. BALLON FLIGHT ON BARBUDA.
Austria, Michel 1580, cancelled post card with stamp
1978. 60. BALLONPOST.
Austria, Michel 1247, cancelled post card with stamp
1967. 38. BALLONPOST.
Austria, Michel 1657, Cover
1981. 23. SONDERBALLONFLUG.
Austria, Cover
1992. 87. BALLONPOST.
Austria, Michel 1825, Cover
1985. 74. BALLONPOST.
Austria, Michel 1934, cancelled post card with stamp
1988. BALLONPOST WERBESHAU.
Austria, cancelled post card with stamp
1982. 67. BALLONPOST.
Austria, cancelled post card with stamp
1991. 86. BALLONPOST.
Austria, Michel 1508, Cover
1976. 55. BALLONPOST.