Cover franked with pair 1934 2c bright blue with 'AEREO INTERIOR 1934' overprint and 1927 1c olive green TAX issue (SG 279 & 223) tied by COBAN cds in purple dated JUL 26 1934 and also by large SERVICIO EXPRESO cancel in black dated 12 M. 26 JUL 1934. Addressed to GUATEMALA CITY with arrival cds dated the same day on reverse.