Printed 'Secretaria de la Economia Nacional - Oficina de Publicaciones' OFFICIAL postcard franked with pair 1933 3c brown 'SERVICIO OFICIAL' overprint issue (SG O542) tied by OFICIAL MEXICO D.F. cds dated 23 OCT 1934. Addressed to the UNITED NATIONS in GENEVE, SWITZERLAND, the message being an acknowledgment for receipt of the latest UN publication.