1 1/2 Real Plata Boliviana

The Banco del Rosario was one of several provincial banks chartered in Argentina during the 1860s under legislation that allowed individual provinces to establish note-issuing institutions before any national banking law existed. The denomination itself — 1½ Real Plata Boliviana — reflects how thoroughly Bolivian silver coinage had penetrated the River Plate economy by mid-century, functioning as everyday transactional currency across the interior provinces long after Argentine federal coinage was nominally in circulation.

PS prefix in the Pick numbering places this firmly in the South American private and provincial bank category. Very few Banco del Rosario notes of any denomination are documented in institutional collections.