Commercial cover franked with 1929 2c bright blue and 5c carmine red and 1935 5c light blue and strip of three 15c carmine 'EXTERIOR' Air issue on front plus 1927 1c olive green TAX issue on reverse (SG 229, 232, 310, 312 & 223) all tied by SERVICIO INTERNACIONAL AEREO GUATEMALA cds's dated 17 MAR 1936. Sent airmail to CHILE with transit & arrival cds's on reverse.