Cover franked with 1929 15c on 15p black AIR issue, 1929 5c on 3p deep green 'Opening of Railway between Guatemala and El Salvador' overprint issue and 1927 1c olive green TAX issue (SG 241, 245 & 223) all tied by SERVICIOAEREO INTERNACIONAL GUATEMALA cancels dated 15 ABR 1931. Addressed to GERMANY.