Registered cover franked with 1927 1p emerald green and 1p 50c red brown plus 1929 2p 85c on 5c dull purple 'AIR 'Surcharge' issue (SG 302, 305 & 345) tied by SCIO AEREO POSTAL PARAGUAY cds's dated 1 JAN 1929 with printed registration label alongside. Flown on the Inaugural ASUNCION - BUENOS AIRES flight (on the 2nd of Jan) by 'Vachet'. Addressed to BUENOS AIRES with arrival cds's on reverse dated 2 JAN 1929. (Muller #3, rated 3000pts)