Registered airmail cover franked with 1927 1p scarlet and 1932 20p yellow brown 'Triangular' ZEPPELIN issue on front and additional 1932 1p 50c purple on reverse (SG 303, 439 & 441) tied by SCIO AEREO POSTAL PARAGUAY cds's dated 1 MAR 1933 with printed registration label with manuscript 'Asuncion' on front. Addressed to SPAIN with arrival mark on reverse. The 20p triangle is uncommon on cover.