This is a 1915 fiscal revenue stamp issued by the Province of Santa Fe, Argentina. Printed in bold orange-red, it carries the denomination of 1 Peso and was used for “Control Impuestos” (tax control). The design features the provincial arms flanked by ornate scrollwork, with the inscription “Comisiones de Fomento” (Development Commissions). A bold black serial number 138675 is prominently overprinted at the top, adding to its authenticity and uniqueness. These stamps were not for postal use but served as official revenue issues, making them significant for collectors specializing in Argentinian fiscal history.