1 Peso Boliviano

Banco Mauá y Ca. was the Argentine arm of the commercial empire built by Irineu Evangelista de Sousa — the Baron of Mauá — whose banking network stretched across Brazil, Uruguay, and the Río de la Plata region in the 1860s. The Rosario branch issued peso boliviano-denominated notes rather than pesos fuertes, reflecting the monetary conventions still in use across the interior of Argentina before national currency unification.

The American Bank Note Company engraved and printed the series in New York, common practice for South American private banks seeking security printing that local facilities could not match. Mauá's entire financial operation collapsed in 1875, making surviving issued notes from any of his banks genuinely scarce.