50 Mil Reis

The Banco Industrial do Porto was a regional commercial bank operating out of Porto — not a central authority — which makes its note-issuing activity an artifact of Portugal's fragmented pre-central-bank banking period, when numerous provincial institutions held the right to circulate paper. This 50 Mil Reis belongs to that contested landscape of competing private issuers whose notes rarely traveled far beyond their home region and were often refused or discounted outside of it.

Pick 183 is sparsely documented, and surviving examples are genuinely uncommon — the bank's note-issuing history is not well catalogued in secondary literature, which makes provenance records where they exist more useful than usual.