Cover franked with 1934 15c ultramarine with 'AEREO EXTERIOR 1934' overprint, 1929 5c carmine red and 1927 1c olive green TAX issue (SG 281, 232 & 223) tied by GUATALON SUCHITEPEQUEZ cds's dated 31 JUL 1935. Addressed to PANAMA with transit & arrival marks on reverse.