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1915 PRZEMYŚL / 2 cards: FLIEGERPOST PRZEMYŚL / JÄNNER 1915, violet straight line postmark on yellow card FP, supplemented with violet round "IX./54" (Tarnstempel), then red line ZENSURIERT and violet ZUR BEFÖRDERUNG GEEIGNET + FLIEGERPOST PRZEMYŚL / 1915 violet straight line postmark on/for green card FP, supplemented with blue round "IX./54", then red line ZENSURIERT and violet ZUR BEFÖRDERUNG GEEIGNET, both addressed to Hungary; folds, toned U:A5
1918 KRAKOW - WIEN / airmail letter to Vienna, with Charles 15h and airmail stamp with overprint FLUGPOST 4 Koruna, CDS CRACOW 1/ ....18, round POCZTA LOTNICZA KRAKOW 1/ 10.VIII., on reverse arrival postmark WIEN 1 FLUGPOST 10.VII.; good condition U:A5
1933 GILDER MAIL / 3 p.stat cards "Robert Kronfeld Vier-länder-flug", variously uprated with airmail and postage stamps, various special postmarks WIEN - WIPA 1933, violet flight cachet POST SEGELFLUG / ÖSTERREICH-UNGARN-ITALIEN-SCHWEIZ WIEN 1/ JULI 1933; very fine U:A5