50 Pesos Bolivianos

The sheer number of signature combinations on this single type — over two dozen pairings across series running from B through the upper alphanumeric ranges — reflects more than routine staff turnover at the Banco Central. Bolivia's 1960s were politically turbulent, with repeated changes of government and central bank leadership following the 1952 revolution's long economic aftershocks. The Milton Paz signatures dominate the middle run; he served as president of the Banco Central through much of the decade, providing unusual continuity against a backdrop of revolving co-signatories.

De La Rue printed the type throughout its entire circulation life, the series letters advancing as successive consignments were ordered from London.