Cover franked with 1929 200rs carmine and 300rs light blue 'Santos Dumont' AIR issue and 1931 200rs on 300rs rose red (SG 470/471 & 505) tied by RIO DE JANEIRO cds dated 1 XI. 1931 with fine PANAIR DO BRASIL SERVICIO AEREO RIO DE JANEIRO cds alongside. Flown on the Rio de Janeiro - Porto Alegre first flight of the 2nd November with first flight cachet in black on front. Addressed to PORTO ALEGRE with arrival mark on reverse. (Muller #138)