Sudan – back of the book issues

Military stamps
 File:Sudan Army off vert.jpg|1905 1m small overprint File:Sudan army serv horiz.jpg|1906 5m value File:Sudan AS a.jpg|1922 2pi "AS" perfin|1922 2pi large AS perfin 
 * In 1905, contemporary stamps in the two different watermarks were overprinted ARMY / OFFICIAL in large letters reading up. The 1m also exists with overprint reading down. Overprints in smaller letters are also known.
 * In 1906-11, overprints reading Army / Service were issued, again in two different watermarks.
 * In 1913-22, contemporary stamps were punched with a large A S perfin (no point to top of "A").
 * In 1922-24, three values with a smaller perfin A S were issued (pointed top of "A").

Military telegraph stamps
 File:Sudan telegraph.jpg|1898 10pi complete pair 
 * In 1885, telegraph stamps of Bechuanaland were used in Sudan, recognizable by coded cancels.
 * In 1897, five postage stamp values were overprinted with TEL in an oval.
 * In 1898-99, two-part designs were issued in 3 different watermarks. One side would be used on a telegram and the other half would be kept as a receipt.

Official stamps
 File:Sudan OSGS.jpg|1903 5m overprint File:Sudan 10m SG.jpg|1922 10m perfin 
 * In 1900 and 1901, 5m and 1m definitives were punched with a large S. G. individually. There are 16 holes in the "S".
 * In 1902, 1m definitives were overprinted O.S.G.S. (On Sudan Government Service). The "S" is wide in the overprint.
 * In 1903-12, more definitives were similarly overprinted; the "S" is not wide here.
 * In 1913-22, stamps had a medium size SG perfin applied. The "S" has 12 holes.
 * In 1922, then-current small size definitives had a smaller SG perfin applied. The "S" has 9 holes
 * In 1927-30, then-current stamps were similarly perfinned.

 File:Sudan 8pi SG.jpg|1946 8pi overprint File:Sudan SG ovpt bridge.jpg|1950 2pi value File:Sudan 5m warrior SG ovpt.jpg|1951 8m value File:Sudan 50p SG ovpt.jpg|1951 50pi value 
 * In 1936-46, then-current stamps were overprinted S.G.. A variant overprint has a longer tail to the "S".
 * In 1948, the issue with revised inscriptions were similarly overprinted.
 * In 1950, pictorial airmails were also overprinted S.G.
 * In 1951-62, definitives were similarly overprinted.

 File:Sudan 35m animals offic.jpg|1962 35m value 
 * In 1962, pictorial definitives on watermarked paper were overprinted with two arabic characters.
 * In 1975-79, definitives on unwatermarked paper were similarly overprinted.

Postage due
 File:Sudan 2m ovptd due.jpg|1897 2m value File:Sudan steamer due.jpg|1927 4m value 
 * In 1897, Egyptian dues were overprinted with the bilingual "SOUDAN" overprints like the regular issues.
 * Beginning in 1901, country-specific dues were issued on ordinary paper with multiple star and crescent watermark.
 * In 1927-30, the same steamboat design was issued on chalky paper with multiple SG watermark.
 * In 1948, the Arabic inscription was changed.
 * In 1978, two values on Sudanese arms watermark paper were issued.

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