Cover with boxed 'S.O.' at top, straight line 'URGENTE' and boxed 'ESPECIAL' official markings on front & reverse franked with 1954 40c scarlet with locally made 'SERVICIO OFICIAL' handstamp in blue (SG O870 variety) tied by fine SAN MIGUEL "CTES" cds dated 24 JUL 1957. Addressed to COLONIA MADARIAGA, CORRIENTES with arrival cds on reverse. An unusual provisional official issue.