1925 (1 July) flown card from Warszawa to Gdansk, franked with L.O.P.P. 50gr and 1zl, supplemented by a 30gr government franking alongside, tied by Warszawa cds, with red "Mit Luftpost befordert flugpostampt Danzig 5." hs on back (Image)

Est.$250

1925 (12 Mar) flown card from Warszawa to Gdansk, franked with L.O.P.P. 10gr and 50gr, with 30gr government franking alongside, tied by cds, with framed "Samolotem" and "Pobrano/Percu Gr.5" charged on arrival, fine (Image)

Est.$150

1925 (31 Dec) Warszawa to Krakow, flown cover franked with L.O.P.P. 10gr, with 30gr government franking alongside, tied by Warszawa Port Lotniczy departure pmks, with boxed "Nadeszlo Poczta Lotnicza" and arrival pmk on back (Image)

Est.$150

1926 (1 Apr) Warszawa to Prag, first flight cover franked on both sides with government franking paying total of 68gr, with "L'Inauguration du Service Aerien International 1.VI.1926" and boxed "24gr" due markings, arrival pmk on back, fine (Image)

Est.$150

1926 (9 Nov) Warszawa to Krakow, flown cover franked with L.O.P.P. 1zl surcharge, with 30gr government franking alongside, tied by Warszawa Port Lotniczy cds, with red "Nadeszlo Poczta Lotnicza" and other markings (Image)

Est.$250

1928 (19 Sep) Warszawa to Lwow, flown cover franked with L.O.P.P. 50gr, with 10gr government franking alongside, tied by Warszawa Port Lotniczy (19 Sep) cds, with red "Nadeszlo Poczta Lotnicza" and violet "20gr" due marking, arrival pmk on back (Image)

Est.$150