






Etiquettes issued by various airlines:





Airmail cover from Vienna to Bombay via Karachi. The airmail etiquette has been canceled at Karachi on 17th October, 1931.
Cover is postmarked at Vienna on 7.X.31 which must be the date of posting, but has actually been dispatched by airmail on 11.X.31 as seen by the circular postmark "WIEN 11.X.31 Flugpost"
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