50 Centavos Ejército Constitucionalista

The Ejército Constitucionalista emergency issues from San Luis Potosí belong to the chaotic monetary environment of the Mexican Revolution, when federal currency had collapsed in practical terms across large parts of the country and regional military commanders issued their own notes to pay troops and procure supplies. These fractional cardboard pieces — more chit than banknote — were produced under field conditions with no central printing authority overseeing quality or serialization.

The 1910 date warrants skepticism. Most Constitutionalist issues from San Luis Potosí are better associated with 1913–1915 activity; a piece dated 1910 predates the Constitutionalist movement itself, which formally organized following Huerta's coup in February 1913.