This 1958 stamp from Spanish Guinea (now Equatorial Guinea) was issued as part of the Pro-Indígenas series, highlighting missionary efforts in the colony. The 20 céntimos design depicts a Christian missionary holding a cross aloft, surrounded by indigenous children, symbolizing religious conversion and education. The inscription "1883 Pro-Indígenas 1958" commemorates 75 years of missionary work in the territory. Printed in deep green, the stamp reflects Spain’s colonial-era themes of evangelization and cultural influence. A striking historical issue, it embodies both colonial propaganda and the philatelic legacy of African colonial territories.