Airmail cover with manuscript return address on reverse 'Ola Berta Gut. San Jeronimo Sud, F.C.N. FB.M. Rep Argentina' franked on front with 1945 pair 20c slate blue & cobalt and 1952 5c olive grey and 1p deep brown 'Eva Peron' issue (SG 755, 835 & 842) tied by multiple strikes of SAN JERONIMO SUD S.FE cds dated 13 MAY 1953. Addressed to SWITZERLAND. San Jeronimo Sud was a Swiss colony founded in the late 1800's.