Original:  During 1958-1978 the pound was pegged to the U.S. dollar at a rate of $2.87156 per Sudanese pound. Thereafter, the pound underwent successive devaluations. The pound was replaced in 1992 by the dinar (SDD) at a rate of 1 dinar = 10 pounds. While the dinar circulated in northern Sudan, in Southern Sudan, prices were still negotiated in pounds, whilst in Rumbek and Yei, the Kenyan shilling was used and accepted more within the transport sectors as well as for hotels/accommodation. Second pound (SDG) According to the Comprehensive Peace Agreement between the government of the Republic of the Sudan and the Sudan People's Liberation Movement, the Central Bank of Sudan (CBOS) shall adopt a program to issue a new currency as soon as is practical during the Interim Period. The design of the new currency shall reflect the cultural diversity of Sudan. Until a new currency has been issued with the approval of the Parties on the recommendations of the CBOS, the circulating currencies in Southern Sudan shall be recognised. The second pound began introduction on 9 or 10 January 2007, and became the only legal tender as of July 1, 2007. It replaced the dinar at a rate of 1 pound = 100 dinars or 1 pound (SDG) = 1000 pounds (SDP). Third pound The third edition of the Sudanese pound was established on 24 July 2011 following the secession of South Sudan from the Republic of URL For a wider history surrounding currency in the region, see The History of British Currency in the Middle East. The Sudanese pound was devalued on 23 February 2021, with the official (indicative) exchange rate set to 375.08 Sudanese pounds per U.S. dollar (from the fixed rate of 55 pounds), closing the gap between the commercial and black market exchange rates. Coins Local coinage in Sudan: issues of the Mahdi and Khalifa and of Darfur In 1885, the Mahdi issued silver coins for 10 and 20 qirush and gold 100 qirush. These were followed by issues of the Khalifa in denominations of 10 para, 1, 2, 2½, 4, 5, 10 and 20 qirush. These coins were initially minted in silver in 1885. Over the following eleven years, severe debasement occurred, leading to billon, then silver-washed copper and finally copper coins being issued. The coinage ceased in 1897. During 1908-1914, a local coinage was issued in Darfur in western Sudan. These were issued under the authority of Ali Dinar and resembled contemporary Egyptian coins. First pound In 1956, coins were introduced in denominations of 1, 2, 5 and 10 millim, 2, 5 and 10 qirush. The millim denominations were struck in bronze, whilst the qirush denominations were in cupro-nickel. The 2, 5 and 10 millim were scallop shaped, although a round 5 millim was introduced in 1971. The 1 and 2 millim were last struck in 1969, the last 5 millim in 1978. In 1983, brass 1, 2 and 5 qirush, a reduced size 10 qirush and a cupro-nickel 20 qirush were introduced. In 1987, aluminium-bronze 1, 5, 10, 20, 25 and 50 qirush and 1 pound were introduced, with the 25 and 50 qirush square and octagonal in shape, respectively. In 1989, stainless-steel 25 and 50 qirush and 1 pound were issued. This is the general pattern, in addition to these coins there are collector-oriented issues and various oddities. See popular coin catalogues for details. Sudanese dinar See Sudanese dinar. Second pound Coins in denominations of 1, 5, 10, 20 and 50 qirush were introduced alongside the circulating dinar coins. The Central Bank of Sudan states that the 5 qirush coins are yellow coloured (perhaps aluminium-bronze) and the 10 qirush is silver coloured (made of stainless steel). The 20 and 50 qirush coins are bi-metallic, with the 20 qirush yellow ringed with a silver coloured centre and the 50 qirush the opposite. Banknotes First pound In April 1957, the Sudan Currency Board introduced notes for 25 and 50 piastres, 1, 5 and 10 pounds. Note production was taken over by the Bank of Sudan in 1961. 20-pound notes were introduced in 1981, followed by 50 pounds in 1984 and 100 pounds in URL . Sudanese dinar When introduced on 8 June 1992, the Sudanese dinar replaced the first Sudanese pound at a rate of 1:10. Questionable new notes In 2005, the National Public Radio of the United States reported that forces in Southern Sudan were printing pound notes bearing the name "Bank of New Sudan", but there is no such bank. In addition, numbers of the banknotes had duplicate serial numbers. Their legitimacy is questionable.New Sudan high denomination notes sought. Banknote News. Retrieved 2012-05-22.The Elusive Banknotes of New Sudan, Peter Symes, pjsymes.com.au. January 2011. Retrieved on 2014-03-09. Second pound When introduced on 10 January 2007, the second Sudanese pound replaced the Sudanese dinar at a rate of 1:100. This new currency was mandated by the 2005 Comprehensive Peace Agreement signed between the Sudanese government and the Sudan People’s Liberation Movement to end the country’s 21- year civil war. Deputy Governor Badr-Eddin Mahmoud said the cost to print the new currency was US$ 156 million.
Revised:  During 1958-1978 the pound was pegged to the U.S. dollar at a rate of $2.87156 per £SD1. Thereafter, the pound underwent successive devaluations. The pound was replaced in 1992 by the dinar (SDD) at a rate of 1 dinar = £SD10. While the dinar circulated in northern Sudan, in Southern Sudan, prices were still negotiated in pounds, whilst in Rumbek and Yei, the Kenyan shilling was used and accepted more within the transport sectors as well as for hotels/accommodation. Second pound (SDG) According to the Comprehensive Peace Agreement between the government of the Republic of the Sudan and the Sudan People's Liberation Movement, the Central Bank of Sudan (CBOS) shall adopt a program to issue a new currency as soon as is practical during the Interim Period. The design of the new currency shall reflect the cultural diversity of Sudan. Until a new currency has been issued with the approval of the Parties on the recommendations of the CBOS, the circulating currencies in Southern Sudan shall be recognised. The second pound began introduction on 9 or 10 January 2007, and became the only legal tender as of July 1, 2007. It replaced the dinar at a rate of £SD1 = 100 dinars or £SD1 pound (SDG) = £SD1,000 (SDP). Third pound The third edition of the Sudanese pound was established on 24 July 2011 following the secession of South Sudan from the Republic of URL For a wider history surrounding currency in the region, see The History of British Currency in the Middle East. The Sudanese pound was devalued on 23 February 2021, with the official (indicative) exchange rate set to £SD375.08 per U.S. dollar (from the fixed rate of £SD55), closing the gap between the commercial and black market exchange rates. Coins Local coinage in Sudan: issues of the Mahdi and Khalifa and of Darfur In 1885, the Mahdi issued silver coins for 10 and 20 qirush and gold 100 qirush. These were followed by issues of the Khalifa in denominations of 10 para, 1, 2, 2½, 4, 5, 10 and 20 qirush. These coins were initially minted in silver in 1885. Over the following eleven years, severe debasement occurred, leading to billon, then silver-washed copper and finally copper coins being issued. The coinage ceased in 1897. During 1908-1914, a local coinage was issued in Darfur in western Sudan. These were issued under the authority of Ali Dinar and resembled contemporary Egyptian coins. First pound In 1956, coins were introduced in denominations of 1, 2, 5 and 10 millim, 2pt, 5pt and 10pt. The millim denominations were struck in bronze, whilst the qirush denominations were in cupro-nickel. The 2, 5 and 10 millim were scallop shaped, although a round 5 millim was introduced in 1971. The 1 and 2 millim were last struck in 1969, the last 5 millim in 1978. In 1983, brass 1pt, 2pt and 5pt, a reduced size 10pt and a cupro-nickel 20pt were introduced. In 1987, aluminium-bronze 1pt, 5pt, 10pt, 20pt, 25pt and 50pt and £SD1 were introduced, with the 25 and 50 qirush square and octagonal in shape, respectively. In 1989, stainless-steel 25pt and 50pt and £SD1 were issued. This is the general pattern, in addition to these coins there are collector-oriented issues and various oddities. See popular coin catalogues for details. Sudanese dinar See Sudanese dinar. Second pound Coins in denominations of 1pt, 5pt, 10pt, 20pt and 50pt were introduced alongside the circulating dinar coins. The Central Bank of Sudan states that the 5pt coins are yellow coloured (perhaps aluminium-bronze) and the 10pt is silver coloured (made of stainless steel). The 20pt and 50pt coins are bi-metallic, with the 20pt yellow ringed with a silver coloured centre and the 50pt the opposite. Banknotes First pound In April 1957, the Sudan Currency Board introduced notes for 25pt, 50pt, £SD1, £SD5 and £SD10. Note production was taken over by the Bank of Sudan in 1961. 20-pound notes were introduced in 1981, followed by 50 pounds in 1984 and 100 pounds in URL . Sudanese dinar When introduced on 8 June 1992, the Sudanese dinar replaced the first Sudanese pound at a rate of 1:10. Questionable new notes In 2005, the National Public Radio of the United States reported that forces in Southern Sudan were printing pound notes bearing the name "Bank of New Sudan", but there is no such bank. In addition, numbers of the banknotes had duplicate serial numbers. Their legitimacy is questionable.New Sudan high denomination notes sought. Banknote News. Retrieved 2012-05-22.The Elusive Banknotes of New Sudan, Peter Symes, pjsymes.com.au. January 2011. Retrieved on 2014-03-09. Second pound When introduced on 10 January 2007, the second Sudanese pound replaced the Sudanese dinar at a rate of 1:100. This new currency was mandated by the 2005 Comprehensive Peace Agreement signed between the Sudanese government and the Sudan People’s Liberation Movement to end the country’s 21- year civil war. Deputy Governor Badr-Eddin Mahmoud said the cost to print the new currency was US$ 156 million.
Edit intent: clarity