Issued by San Marino in 1965, this 4 Lire commemorative features the Elasmosauraus, a long-necked prehistoric marine reptile from the Mesozoic era. Part of San Marino’s popular prehistoric animals / natural history thematic issues, the stamp showcases detailed mid-20th-century scientific illustration against a marine backdrop. Notably, the inscription reflects the period spelling “Elasmosauraus,” adding minor variety interest for specialists. A desirable thematic item for dinosaurs, fossils, and science collectors, as well as for San Marino country collections.