This 55 Lire stamp from Vatican City, issued in 1965, commemorates the conclusion of the Second Vatican Council (Concilium Oecumenicum Vaticanum II). The red-toned design captures a solemn scene of bishops and clergy gathered before the altar in St. Peter’s Basilica, marking a historic moment in the Church’s modernization efforts. The surrounding inscription in Latin refers to the council’s completion that year (A. MCMLXV Peractum). Highly significant for ecclesiastical history, this issue holds strong appeal for collectors of religious and Vatican philately.