1 Peso Fuerte

The Banco de Londres y Río de la Plata was the first British-owned bank to operate in Argentina, established in Buenos Aires in 1862 and expanding to Rosario shortly after. This branch issue is notable precisely because Rosario was not yet the commercial powerhouse it would become — the city's rise as the country's primary grain export port was still a decade away, and a London-backed bank issuing peso fuerte notes there in 1866 reflects speculative confidence more than established trade infrastructure.

The peso fuerte itself was already a transitional unit by this date, with Argentina's monetary fragmentation making branch-specific issues from foreign banks a practical necessity rather than an anomaly.