Sudan. (Nigeria). 1942. Registered Air Mail envelope addressed to the United States bearing Sudan SG 41, 5m olive and black (4) and SG 46b, 20p pale blue and blue tied by oval Registered/Khartoum with matching registered label routed via Nigeria with Lagos transit and framed horseshoe 'Censor' on face in violet with 'Examined By / 1784' censor tape and Miami and New York receiver on reverse. Nice item flown by Pan Am.