½ Libra Peruana de Oro

The Banco de Reserva del Perú was established in 1922, replacing the earlier system of commercially issued banknotes with centralized emission. This ½ Libra denomination belongs to the bank's earliest series, issued while Peru still pegged its currency to the gold-denominated Libra Peruana — a unit modeled closely on the British sovereign in weight and fineness. The peg would not survive the decade; by 1931 the system collapsed under external debt pressure and Peru shifted to the Sol.

ABNC's contract for this series was typical of the period, when South American central banks routinely sent printing work to New York rather than developing domestic security printing infrastructure. The watermark is the sole anti-counterfeiting measure — no colored fibers, no serial number security thread.