Issued to commemorate the 100th anniversary of San Marino’s first postage stamp (1877–1977), this elegant high-value commemorative features the historic Three Towers of San Marino within the national coat of arms bearing the motto Libertas. The classic engraved-style design reflects traditional European security printing and philatelic heritage. Its large format and rich brown monochrome tone make it visually striking in thematic and country collections. A key modern commemorative marking San Marino’s proud postal history, highly suitable for philately-themed exhibits.