10 Pesos

Banco del Ecuador was a private commercial bank operating out of Guayaquil, and for decades it functioned as something close to a de facto central bank in Ecuador — a role fiercely contested by Quito-based financial interests. The American Bank Note Company produced most of the bank's higher-denomination paper, a relationship common among South American issuers who lacked domestic printing infrastructure capable of the intaglio security work ABNC provided.

Pick 141B sits within a series that spans several signature combinations, and the specific official pairing on this type is what distinguishes it from its near-identical neighbors in the catalog.