Flight of South-Western Poland in Lviv 1936, envelope addressed to Lviv sent on 31.V.36 by balloon on the route Krakow-Iglomia (date stamp on the front), stamps cancelled with occasional stamp "VII LOT POŁUDNIOWO ZACHODNIEJ POLSKI POCZTA BALONOWA" unstamped in purple (154 consignments), on the reverse a date stamp and a 10 gr. contribution to the Balneological Fund.
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