Issued by Spain, this 6 PTA definitive features a formal portrait of King Juan Carlos I, symbolizing Spain’s transition into a modern constitutional monarchy. Printed by the F.N.M.T., the clean photogravure design and solid emerald-green shade make it a classic of Spanish everyday postage. Part of the long-running 1970s–80s definitive series, it is widely collected in shades, printings, and perforation varieties. Ideal for monarch, Europe, and definitive specialists, especially in mint or well-centered condition. A dependable staple for building a complete Spain definitive page or thematic royal collection.