1925 two cards flown from Warszawa (10 March and 9 October) to Gdansk, each with two 10gr L.O.P.P. labels, used in combination with regular 30gr franking, one charged 5gr due, handstamps include "Samolotem" and "Par Avion", also "Mit Luftpost Befordert Flugpstampt Danzig 5.", fine (Image)

Est.$250

1925 (9 Apr) cover flown from Warszawa to Gdansk, franked with imperforate 5gr, variety values omitted at top, used in combination with regular 30gr franking, charged 5gr due, handstamps include "Samolotem" and "Mit Luftpost Befordert Flugpstampt Danzig 5.", slight toning, otherwise fine and undoubtedly rare (Image)

Est.$500

1926 (19 Oct) registered cover from Siemiatycze to Paris, franked with 1zl "Poczta Balonowa" adhesive, used in combination with 80gr regular franking, red "Balon Krakow" and Warszawa Port Lotniczy transit pmk, fine (Image)

Est.$250

1928 (9 Nov) cover flown from Warszawa to Krakow, franked with imperf. "Tydzien Lotniczy" L.O.P.P. sheet margin single, used in combination with regular 30gr franking, boxed "Nadeszla Poczta Lotnicza" and "Par Avion" bilingual handstamps, fine (Image)

Est.$250

1928 (30 Sep) three covers flown from Siniawka, Kuznica and Wasilkow to Warszawa, each franked with "Poczta Balonowa 1zl L.O.P.P." adhesives, used in combination with regular 5gr franking, tied by "Raid Balonow Kulistych" cds, with corresponding "Balon Lwow", "Balon Warszawa" and "Balon Poznan" handstamps alongside, v.f., scarce (Image)

Est.$1,000

1929 (30 Apr) cover flown from Warszawa to Lwow, franked with four different surcharges 5gr, 10gr, 25gr and 50gr L.O.P.P. labels, used in combination with regular 10gr franking, charged 5gr due, handstamped "Nadeszla Poczta Lotnicza", with arrival pmk on back, some adhesive toning around the perforations, otherwise fine and colorful cover, scarce (Image)

Est.$500

1934-36 selection of 10 covers or cards, various frankings and flights including Balloon dispatches, one 1921 Poznan Issue on cover to Warszawa, etc., fine-v.f. (Image)

Est.$500

1936 (27 Oct) two first flight covers from Lwow to Tel Aviv, one registered, each with appropriate cachets and markings, fine-v.f. (Image)

Est.$150

1936 (17 May) two picture postcards flown from Bialosliwie to Warszawa, each franked with 10gr L.O.P.P. labels, "Poczta Balonowa" and "Balon Wilno" and "Balon Gryf" handstamps alongside, fine-v.f., scarce (Image)

Est.$500