Issued by Spain in 1973, this 3-peseta commemorative stamp honors the 600th anniversary (VI Centenario) of the founding of Guernica, a historic Basque town. The design features the iconic Árbol de Guernica, a centuries-old oak symbolizing Basque liberty and traditional self-governance. Behind the oak stands the classical pavilion where the tree is ceremonially preserved. Printed by F.N.M.T. (Fábrica Nacional de Moneda y Timbre), this issue is prized for its cultural symbolism and its strong connection to Basque heritage and Spanish regional history.