Issued for the Exposição de Arte Sacra Missionária (Missionary Sacred Art Exhibition), this 1951 Portuguese Guinea stamp features a bold central cross flanked by angelic figures, symbolizing faith and missionary heritage. Printed in a warm brown-olive tone by Casa da Moeda, the design carries strong mid-century religious art styling. The stamp also functioned as an exhibition entrance label, adding dual historical interest. Its colonial West African origin and thematic religious subject make it desirable for both Portugal-area and thematic collectors. A classic post-war commemorative with clean typography and striking symmetry.