This stamp from Spanish Guinea (Guinea Española) was issued in 1958 to commemorate the 75th anniversary of the Pro-Indígenas mission movement (1883–1958). The design depicts a missionary figure raising a cross while surrounded by indigenous children, symbolizing missionary education and religious outreach in the colony. Printed in a deep green tone, the stamp reflects the colonial era themes commonly used in Spanish Guinea’s mid-20th-century postal issues. The inscription “Guinea Española Correos” identifies the colonial postal authority. Collectors often seek this issue as part of Spanish colonial Africa sets and missionary-themed philatelic collections.