This 1957 semi-postal from Spanish Guinea was issued for Día del Sello (Stamp Day) and features a striking magenta engraving of two African elephants (Loxodonta africana)—an adult and calf walking through the forest. The denomination 10c + 5c includes a surtax supporting postal initiatives, typical of mid-century semi-postals from Spanish territories. Produced by F.N.M.T. (Fábrica Nacional de Moneda y Timbre), the stamp is admired for its rich tonal depth and elegant wildlife portrayal. A desirable thematic item for collectors of African fauna, Spanish colonial issues, and charity stamps.