10 Pounds

By 1991, Sudan was deep into the economic fallout of al-Bashir's 1989 coup and the subsequent imposition of Islamic banking law, which formally prohibited interest-bearing instruments. The 10 Pound note of this series occupied an awkward transitional position — the country would shift to the Dinar system in 1992, making this among the last issues denominated in Pounds before that revaluation rendered the currency unit obsolete.

Thomas De La Rue's involvement here is worth noting: the contract survived despite Sudan's rapidly deteriorating international relationships, though it would not last much longer into the decade.