Registered Official cover with printed 'Universidad de Buenos Aires - Facultad de Ciencias Medicas Biblioteca' insignia on front franked with strip of three 1936 10c scarlet 'M.J.I.' overprint issue (SG OD68E) plus 1938 5c orange brown with 'SERVICIO OFICIAL' overprint (SG O671) all tied by BUENOS AIRES cds's with black on white registration label and official signature handstamp all on front. Addressed to USA with arrival cds's on reverse.