Aden. 1951. Registered Air Mail postal stationery envelope 'one anna' brown upgraded with SG 20, 2a brown (2) tied by Aden/Reg double ring with Registered label addressed to India with framed Aden censor hand-stamp and label with 'Opened by Censor' label tied by Bombay 'Passed by Censor/C 20' on face. Very fine.