Issued by Vatican City in 1967, this commemorative set marks the Third World Congress for the Lay Apostolate held in Rome from 11–18 October 1967. The design features a prominent Christian cross beside a globe surrounded by human figures, symbolizing the global participation of laypeople in the mission of the Church. The inscription in Latin reads “III Congresso Universalis Pro Apostolatu Laicorum.” The stamps were printed by the Vatican’s official press in Rome. This meaningful issue reflects the spirit of international cooperation and the growing role of lay Catholics following the reforms of the Second Vatican Council.