40 Centavos Fuertes Pattern

Argentina's 1879 coinage patterns emerged from a period of acute monetary instability, when the national government was actively debating whether to abandon provincial coinage systems in favor of a unified decimal currency. The 40 centavos fuertes denomination was never adopted for circulation — the broader reform that followed, culminating in the peso moneda nacional of 1881, rendered the entire fuertes series obsolete before it began.

The copper striking referenced as KM#E4a is among several metal variants tested that year, distinguishing it from the silver and other trial compositions catalogued under the same CJ#29.3 grouping.