20 Centavos

The Banco Nacional Ultramarino's wartime fractional notes of 1918 were emergency responses to a coin shortage that had grown acute across Portuguese colonial territories and metropolitan Portugal alike. Bronze and nickel had been diverted or were simply hoarding, and small-change paralysis was hitting everyday commerce hard. The BNU stepped in where the mint could not.

P#50 belongs to a family of low-denomination emergency issues produced in Lisbon for domestic circulation — unusual for a bank whose primary mandate was colonial finance. The BNU's normal business was the overseas territories, which makes this metropolitan stopgap issue a minor institutional oddity worth noting.