Registered cover franked with 1923 pair 10c rose carmine, pair 1927 50c brown red & indigo AIR issue and 1929 20c sepia AIR issue (SG 442, 456 & 479) tied by MIXCOAC cds's with printed blue on white registration label alongside. Sent airmail to PERU with two blue 'Starburst' OFFICIAL SEALS on reverse tied by various markings including oval CALLAO, PERU arrival marks.