100 South Sudanese Pounds

South Sudan's 2011 independence from Sudan — the result of a referendum in which over 98% voted for secession — created an immediate and practical problem: the new state needed its own currency within months of becoming a country. The Bank of South Sudan stood up rapidly, and De La Rue, the default choice for newly independent African states throughout the postwar decades, handled the initial series under tight deadlines.

Pick 10 is one of the founding notes of one of the world's youngest currencies, issued the same year the country existed at all.