25 Piastres

The Bank of Sudan was established by the Bank of Sudan Act of 1959, just three years after independence, replacing the Sudan Currency Board. This 25 Piastres note belongs to the first independent series proper — earlier fractional currency had been issued under transitional arrangements that kept the colonial-era Currency Board framework in place longer than most newly independent states tolerated.

The decade-long run of P#11 across multiple governor signatures reflects institutional continuity through a period of considerable political turbulence, including Nimeiry's 1969 coup and the subsequent dismantling of civilian government. Notes bearing the Mirghani signature predate that rupture by very little.