50 Escudos

The Banco Nacional Ultramarino held the note-issuing concession for Portuguese Guinea throughout the colonial period — a commercial bank, not a central bank, operating under Lisbon's oversight while managing currency across multiple African and Asian territories simultaneously. A single plate series often covered several years of issuance, which accounts for the three signature combinations recorded under Pick 86 as different administrators rotated through.

Bradbury Wilkinson printed for dozens of colonial issuers during this period, and the quality of intaglio work on BNU Guinea issues is generally high despite the modest denominations involved.