1918, 50 h. in horizontal pair, each with a double overprint inverted, mint never hinged, very fine and rare, certificate Petriuk (2013) (Fischer-Nr. 28non)

1919, Krakow overprints, 30 h. lilac, plate IIB, pos.29, unused, very fine, private signature, certificate Petriuk (2025)

1921, Red Cross 10+30m. brown-carmine with additional franking, tied by cds. “WARSZAWA 26.4.21” to registered airmail cover to Prague with arrival mark, vertical fold and backflap missing, somewhat stained, otherwise a fine and very rare commercial cover, signed Petriuk with certificate (2025)

1948, 160th Anniversary of the US Constitution, complete set in full sheetlets, mint never hinged, 120 zl. with a peripheral gum bend and a minor corner crease otherwise very fine, all signed Jungjohann BPP

1954, People´s Republic Anniversary complete sets in horizontal gutter pairs, 1,15 zl. with minor gum disturbance, mint never hinged, overall very fine, signed and certificate Petriuk BPP (1990)

“CENZURA LABISZYN”, black two-line censor mark on Germania postal stationery card 7½ pfg. with additional franking 2½ pfg., hoth the postcard and the stamp were invalid, but most likely a busy German postal worker forwarded the card without objection, used from “POSEN W. 18.5.19” to the district court in Labischin, fine and scarce, signed Petriuk with certificate (2025)

“Cenzura Szwadronu Technicznego / Pułku Jazdy Tatarskiej, dnia 18.1.1919. Podpis”, violet, boxed three-line cachet on postcard, with handwritten sender information “Reconnaissance Unit, Tatar Cavalry Regiment, 9th Lithuanian-Belarusian Infantry Division, Field Post No. 24”,  with adjacent cds. “BRZESC LITWESKI 18 1 20” to Wielun, fine and scarce, a.o. signed Petriuk with certificate (2025)

“STACJA ROZDZIELCZA / dla jeńców i internowanych w Kobrynie”, violet three-line cachet on postcard from “KOBRYŃ 1.5.1919” to Lublin, rverse with minor imperfections, otherwise fine. A rare piece of evidence of a Polish prisoner-of-war camp for Russian soldiers during the Polish-Russian War in 1919, signed Petriuk with certificate (2025)

1920, “Cenzura Wojskowa”, polish military censor label tied by oval “Wr. I. / 55” seal to cover from Russia via Moscow to Baranowicze, very rare, sent during the very short period when a postal exchange with Russia was still definitely permitted before the Riga Treaty from March 1921 

1919, 5h. red, horizontal strip of five, position 71-75, tied by cds. “KRAKAU 4.II.19” to local registered cover with return receipt, the other stamp small faults due to being applied over the edge, some minor transportation wear, a very rare cover, signed Mikstein and certificate Petriuk (2025)

1918, Lublin provisional issue, postal stationery card 25h., proof overprint without frame, used with cds. “LUBLIN -8.1.19” and sent to Prague, reverse with long text, very fine. A rarity being the only commercially used proof of that card, certificate Petriuk (2025) (Fischer CP5)

1918, Postal stationery card 15h., type II, paper x, used with cds. “LUBLIN 27.II.19” to Krakow, vertical fold, otherwise fine, scarce, signed Petriuk with certificate (2025) (Fischer Cp4IIb)