This 10 + 5 centimos stamp was issued in 1957 by Spanish Sahara (Sahara Español) to mark the Día del Sello or “Day of the Stamp.” It depicts the Striped Hyena (Hyaena striata) in a detailed engraved portrait, capturing the animal’s wary yet powerful expression. The additional 5 cts surtax was contributed to postal or philatelic promotion funds. Printed by F.N.M.T. (Fábrica Nacional de Moneda y Timbre) in rich violet-rose tones, the design is part of a wildlife-themed commemorative issue celebrating the fauna of the Spanish Sahara.