Issued in 1961 by Spain for its African territory Río Muni, this striking semi-postal stamp features a baboon in bold detail. With a face value of 80 céntimos + 20 céntimos surtax, it was part of the Pro Infancia series, raising funds for children’s welfare. The design highlights the region’s rich wildlife, rendered in deep green tones by the F.N.M.T. (Spanish Mint). Semi-postals from Río Muni are popular among thematic collectors of fauna, colonial issues, and charity stamps. A fine piece that captures both artistic and historical value, this issue reflects Spain’s overseas philatelic legacy.