5 Pesos

The Administración de Hacienda y Crédito Público was Mexico's treasury authority during a period of near-constant fiscal instability — the 1850s saw the country lurching between conservative and liberal governments, each inheriting debts the other had refused to honor. Notes issued under this authority carried real political risk: a change in administration could render them worthless overnight, and often did.

The incomplete date is not a blank error but deliberate practice — ABNC delivered sheets undated, with the issuing office filling in the year at the point of distribution. That detail alone tells you something about how tenuous the production and redemption cycle actually was.