4 Reales Plata Boliviana

The Banco de Londres y Río de La Plata was a British-owned commercial bank that operated branches across Argentina and Uruguay from the 1860s onward, issuing provincial notes denominated in local monetary units rather than sterling. The Rosario branch operated in one of Argentina's most commercially active interior cities, a grain and cattle trading hub that was pulling significant British investment in this period.

Denomination in reales plata boliviana — Bolivian silver reales — rather than pesos fuertes or pesos moneda corriente reflects the currency confusion endemic to mid-century Argentine commerce, where multiple accounting units circulated simultaneously depending on region and trade partner.