Chinfrão - Afonso V Porto mint

The chinfrão was introduced under Afonso V as a fractional silver denomination, part of a broader monetary reorganization that accompanied Portugal's escalating African campaign costs — Ceuta had been held since 1415, and the push into Morocco demanded continuous fiscal adjustment. The Porto mint struck alongside Lisbon during this period, though output from Porto was considerably smaller, making its issues proportionally scarcer in surviving hoards.

Afonso V's reign ended in 1481 with the Portuguese crown deeply indebted from the Moroccan expeditions, including the costly Battle of Toro in 1476 against Castile.