Registered cover franked with 1929 20c purple and 3 x 1930 1s carmine AIR issues (SG 461 & 467) tied by GUAYAQUIL cds dated 2. 4. 1930 with registration markings on reverse. Flown on the GUAYAQUIL - SAN JOSE, COSTA RICA first flight with two different first flight cachets on front. Addressed to GUAYAQUIL with SAN JOSE arrival cds and various other transit & arrival marks on reverse. (Muller #38, 290 covers flown)