Issued by Vatican City to mark the 100th anniversary (1854–1954) of Pope Pius IX’s formal proclamation of the Dogma of the Immaculate Conception, this elegant 3 Lire stamp features a finely engraved portrait of Pope Pius IX in rich violet. The Latin inscription “Dogma Immaculatae Concepti” highlights its strong theological and historical significance. The classic recess-printed design, with sharp line work and papal monogram, reflects mid-century Vatican craftsmanship. A key piece for papal history, Marian devotion, and Catholic thematic collections. Popular among both religious and European commemorative specialists.