The outbreak of the Mexican Revolution in 1910 precipitated one of the most complex and chaotic periods in the history of North American monetary policy. For decades under the dictatorship of Porfirio Díaz, the Mexican economy operated on a relatively stable, centralized banking system dominated by institutions such as the Banco Nacional de México and the Banco de Londres y México. These institutions issued high-quality, intaglio-printed banknotes, heavily backed by silver and gold reserves, which circulated alongside standard silver coinage. This financial architecture collapsed following the assassination of President Francisco I. Madero in 1913 and the subsequent usurpation of the presidency by General Victoriano Huerta.
Huerta’s coup d'état triggered a massive, multi-front civil war. The Constitutionalist forces, led by figures such as Venustiano Carranza, Álvaro Obregón, and Pancho Villa, rose in armed rebellion across the northern states. The immediate economic consequence of this widespread conflict was the manifestation of Gresham’s Law. As uncertainty gripped the nation, citizens, merchants, and foreign investors began hoarding hard assets. The heavy silver coinage that had characterized Mexican commerce—most notably the one-peso "resplandores" and the silver 50-centavo pieces—vanished from circulation almost overnight. The established banking institutions, facing massive capital flight and physical vulnerability to advancing armies, were forced to suspend specie payments.
This hoarding created an acute liquidity crisis. To maintain military operations, pay soldiers, and allow local civilian populations to conduct basic daily commerce, military commanders and regional governors resorted to the issuance of emergency fiat paper money. These unbacked regional banknotes became colloquially known as bilimbiques. The nature of these issues was intensely localized; a banknote printed and accepted by a military garrison in one municipality might be completely rejected, or even represent a treasonous offense to possess, in an adjacent town controlled by a rival faction. The 50 Centavos banknote from Guaymas, Sonora, analyzed in this report, represents a primary material record of this localized economic collapse and the desperate attempts by an isolated federal garrison to maintain a functioning medium of exchange.