1916 (9 July) cover endorsed "Feldpost" with corresponding "Feldpostkomdukteok Piotrkow-Trzebinia" pmk and violet "K.u.k. Komando der Enklave Jasna Gora" handstamp alongside, with Jasna Gora (Ettapenpostampt Nowo Radmosk) return address and sent to Puchberg (Austria), some cover mending and stained at upper left, rare usage from Jasna Gora, signed Korszen, ex-Mikulski (Image)

Est.$800

1918 (29 Oct) Money Order with Austrian franking sent from Miechow to Konsk, with appropriate "K.u.k. Etappenpostamt Miechow" departure and Konsk arrival pmks (Image)

Est.$120

1919 (30 July) free-frank card from an Armored Train "Pociag Kapielowy Peltew" (bathing train "Peltew") with "Glowna Frontowa Poczta Polska" departure cds, sent by a soldier serving aboard the train to a family member in Ostrowiec, v.f., rare usage, signed Korszen, with his 2018 certificate (Image)

Est.$200

1919 (11 July) cover with French "Tresor et Postes" No.309 pmk, addressed to Paris, with violet "Dyrekcja Skarbu i Poczt Armii Generala Hallera" (Treasury and Post Office department of General Haller Army) handstamp, fine official usage, with Korszen certificate (General Haller's Army was a Polish military contingent created in France during the latter stages of World War I. By early 1919, this Army numbered 68,500 men and was fully equipped by the French government) (Image)

Est.$230

1921 (ca) cover with "Ministere de la Guerre Mission Franco-Polonaise" corner cachet (also in Polish) addressed to Paris, with two "R.F." and bilingual corresponding handstamps in red (Image)

Est.$230

1934 picture postcard with 10gr, handstamped "Oplata Ulgowa", reduced military rate with "Tanks and Armored Cards Batalion" handstamp, sent from Krakow to Lodz, some wear and tear, rare (Image)

Est.$100

1939 (7 Apr) picture postcard franked with 5gr adhesive, canceled Poczta Polowa "b" and sent to Podkowa Lesna, fine early Fieldpost usage (Polish forces mobilizing in preparation for German invasion) (Image)

Est.$120

1945 London issue labels, 16 perf. and imperf. letter seals, used and unused, varieties including double and inverted "Fieldpost" overprints, fine-v.f. (Image)

Est.$150