Unusual covers.

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This section describes some unusual covers, handled by the Pneumatic Post system on part of their journeys. See also some of the "Air Mail" items!

Minipic Details
1882: postcard to the Hotel Royal, Singerstrasse
1894: Improper but unchallenged use of Hungarian-franked non-pneumatic stationery card
1900 & 1901: Found In The Letter-box
1930: A philatelic Zeppelin flight cover
1938: A difference in handling on Plebiscite Day
1964: TELEGRAPHENZENTRAL­STATION WIEN cancel but not pneumatically transported