Registered censored airmail cover franked with 1931 500rs red brown 'Industry' issue and pair 1929 5000rs violet blue 'Ruy Barbossa' issue (SG 416 & 465) tied by tow strikes of the undated CORRESPONDENCIA AEREA VIA NYRBA illustrated 'Airplane' cancel in black with boxed registration marking alongside. Addressed to UK, censored with printed black on white 'OPENED BY CENSOR 6220' PC90 censor strip at left and transit & arrival marks on reverse. This cancel was originally used in 1930 predominantly on first flights. An unusual emergency wartime use.