5 Doblones 50 Pesos - Banco de Londres y Río de la Plata

The Banco de Londres y Río de la Plata was the Argentine subsidiary of the London and River Plate Bank, chartered in London and operating from Buenos Aires from 1863. It was one of the few private banks in the region with genuine British backing, and its notes circulated alongside those of local institutions whose reserves were considerably more questionable. The dual denomination — 5 Doblones and 50 Pesos — reflects the monetary confusion of the period, when the doubloon-based accounting system had not yet fully yielded to the peso.

The S-prefix in the Pick reference indicates this is classified as a private or provincial issue, not a national emission — a distinction that mattered enormously to holders when redemption disputes arose.