This Hungarian postage due stamp represents the emergency postal adjustments made during the severe post-World War II inflation period of 1945. Originally issued as a lower-value definitive, the stamp was surcharged with a bold “1945 – 1 pengő” overprint to meet rapidly changing postal rates. The inscription “MAGYAR KIR. POSTA KONTÚLY” identifies it as a postage due issue used to collect insufficient postage fees. Such provisional overprints are highly collectible as historical evidence of Hungary’s dramatic monetary instability before the later hyperinflation peak. A classic transitional issue valued by collectors of European inflation-era philately.