1 Peso Oro Legal

Banco del Ruiz was a regional Colombian institution based in Manizales, the capital of the coffee-growing Caldas department — its notes circulated in an economy driven almost entirely by export coffee, where peso oro denominations had real purchasing weight. The "oro legal" designation was not decorative; it signified legal tender redeemable in gold coin under the monetary reforms following Colombia's catastrophic 1899–1902 civil war, the Thousand Days War, which had destroyed confidence in paper money entirely.

ABNC's involvement signals the bank was serious about forgery resistance at a moment when Colombian regional banks were under intense pressure to prove solvency. The series was short-lived — most private Colombian banks of this type were absorbed or dissolved after the 1923 Kemmerer Mission reorganized the national banking system.