100 Pesos El Banco de Sonora

El Banco de Sonora was one of the more solvent regional banks operating under Mexico's 1897 Ley General de Instituciones de Crédito, which created a two-tier system of privileged circulation banks. Sonora's institution benefited enormously from American commercial activity along the border — mining capital, cattle trade, and cross-border payrolls kept demand for high-denomination notes real rather than ceremonial.

The Revolutionary period ended it. By 1913–1914, Constitutionalist forces under Plutarco Elías Calles and others effectively suspended the old Porfirian banking structure across the northwest, and Banco de Sonora notes became worthless almost overnight. High-denomination survivors like this one were more often kept as records than spent.