Issued by Poland, this high-denomination 1000 Marek (Mk) postage due stamp belongs to the early inflation-period postal issues of the 1920s. The design features the Polish national eagle above crossed postal horns, symbolizing official mail administration and fee recovery. Inscribed “Poczta Polska” and “Dopłata” (Postage Due), it was used to collect insufficient postage from recipients. Such large denominations reflect the economic instability and currency inflation of post-World War I Poland. Collectors value this issue for its historical monetary context and classic engraved typography typical of early Polish postal design.