1 Peso Plata Boliviano

The Banco del Río de La Plata was one of several provincial Argentine banks chartered in the 1860s under the permissive banking legislation that briefly allowed Entre Ríos and other provinces to issue their own currency. Gualeguay, a river port town in Entre Ríos, was a logical seat for a bank with commercial ambitions tied to the Paraná trade routes. The denomination in pesos plata boliviano — Bolivian silver pesos — reflects the chaotic monetary reality of mid-19th century Argentina, where no single national currency dominated and regional commerce ran on whatever specie was trusted locally.

Mayo y Williams operated out of Buenos Aires and handled lithographic work for several of these provincial bank issues. Their output was competent but modest in ambition.