2 1/2 Centavos United States of Colombia

Colombia's fractional copper-nickel coinage of the 1880s was issued under the Rionegro Constitution's federalist structure, which meant the national government had limited fiscal authority and chronic difficulty maintaining a coherent monetary supply. The 2½ centavos denomination is an awkward fraction born of practical necessity — small transactions required coins that silver could not economically serve.

The Bogotá mint struck this type in limited quantities, and surviving examples in any condition above Fine are genuinely scarce. The federal republic itself was abolished just five years later under the centralizing Constitution of 1886, which ended the "United States of Colombia" name entirely.