Sudan, 1906-41 Cover Group. Selection of 11 covers; includes 1941 censor mail to U.S. with "Field Post Office" canceled frankings, 1910's censor mail to England from El-Obeid and Baka, 1937 Atbara to U.S. with Khartoum Airmail backstamp, 1930's first flights and other airmail and registered usages, F.-V.F. or better. Estimate  $150 - 200. $0 (Image)