This Spanish definitive stamp, valued at 0.10 pesetas, features a portrait of King Juan Carlos I in profile. Printed in a bright red-orange tone, it was issued by Correos (the Spanish postal authority) and produced by the Fábrica Nacional de Moneda y Timbre (F.N.M.T.). The design belongs to the long-running “King Juan Carlos I” definitive series introduced in the mid-1970s, symbolizing the new constitutional monarchy following the Franco era. These stamps were widely circulated and are a cornerstone of modern Spanish philately.