This stamp is a Spanish 1 Peseta issue featuring King Ferdinand the Catholic, but it is not a genuine postal issue—it is a well-known forgery by Jean de Sperati’s contemporary rival, Fournier of Vitoria. Printed in blue with a red “Correo Aéreo” (Airmail) overprint, it was produced as part of Fournier’s wide range of philatelic reproductions. The bottom inscription “FOURNIER VITORIA” clearly identifies it as a product of the famous forger’s workshop. Such items are of great interest to collectors of philatelic forgeries, reference material, and airmail history, rather than genuine postal history. It stands as a fascinating example of how forgeries themselves have become collectible and studied in philately.