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1930 first flight PRAGUE - BASILEJ, airmail letter + Printed matter to Switzerland the first flight AD ASTRA, franked with airmail stamp Pof.L4, L5, CDS PRAGUE 82 AIRPORT 2.VI.30, supplemented with frame cancel. and line black cancel. PRVNÍ LET, arrival postmark BASEL FLUGLATZ 2.VI.30 on face-side, sent only 148 mailings; good condition U:A5
1930 first flight PRAGUE - ZÜRYCH, letter sent as Let+Tiskopis 1. flight to Switzerland, with Pof.L4, L5, CDS PRAGUE 82 AIRPORT/ 2.VI.30, supplemented with black cachet 1. flight and frame air mail postmark.., arrival postmark ZÜRICH FLUGPLATZ/ 2.VI.30 on face-side, posted only 42 pcs of mailing!; good condition U:A5
1930 PRAGUE - BUENOS AIRES, off. heavier Reg and airmail letter to Argentina, right franked by stmp Pof.256 10x, 254, general postal-charge 53CZK, CDS PRAGUE 10 HRAD/ 19.II.30, on reverse arrival BUENOS AIRES/ 3.MAR.30; envelope open from 3 sides, from exhibit, fine franking! U:A5
1931 first flight KARLOVY VARY - PRAGUE, comp. 2 pcs of PC 50h Coat of arms sent by air mail to Austria and to Poland, uprated by. mixed franking II. and III. air-mail issue, CDS KARLOVY VARY 1/ 15.V.31, supplemented with cancel. 1. flight KARLOVY VARY and 1. flight PRAGUE 82 AIRPORT, arrival WIEN FLUGPOST/ 15.V.31 and 1x on reverse WARSAW PORT LOTNICZY/15.V.1931, stamps II. air-mail issue on/for both PC zatrženy by blue raddle U:A5
1931 PRAGUE - NEW YORK, commercial air-mail letter to USA franked with. mixed franking airmail stamps issue II and III.., Pof.L4, L5, L8, L9, CDS VARNSDORF 2/ 10.IX.31, on reverse transit PARIS GARE DU NORD AVION/ 10.IX.1931; good condition U:A5
