5 Pesos Plata Boliviana

The "Pesos Plata Boliviana" denomination is the telling detail here. Santa Fé province in the 1860s operated in a monetary environment where multiple peso standards circulated simultaneously — the Bolivian silver peso was a common unit of account in the interior provinces precisely because Buenos Aires-minted and foreign coin supplies were unreliable this far from the coast. Denominating a provincial bank note in Bolivian silver rather than the Buenos Aires standard was a practical commercial decision, not an anomaly.

PS#1591 is among the scarcer entries in the Argentine provincial private bank series. Surviving examples are few enough that auction appearances remain infrequent.