20 Pesos Fuertes

The Banco de Londres y Río de la Plata was the Argentine branch of the London and River Plate Bank, chartered in London in 1862 and among the first foreign commercial banks to establish a serious presence in the Río de la Plata region. The Rosario branch operated with considerable autonomy and issued its own notes distinct from the Buenos Aires branch series — hence the separate Pick Specialized numbering. By 1866, Rosario was emerging as a grain-export hub, and the branch's note issues were tied directly to trade financing rather than government debt.

The American Bank Note Company contract for this series reflects a broader pattern: Argentine provincial and private banks of the 1860s almost universally turned to New York or Philadelphia engravers rather than European ones, largely on cost and turnaround.