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Polish airmail envelope dated 1958, franked with two 50 zł stamps depicting airplanes and a city view, and a 5 zł stamp with a portrait. Recipient: Jan Ribarski, Postanka 19, Backi Petrovac, Yugoslavia. Front has the postmark 'OPOLE 1' and the stamp 'LOTNICZA PAR AVION'. Back indicates the sender: Mgr inż. Bronisław Kowanda, ul. Ożimaka 87 m.3, Opole.