50 Francs

The Banque Nationale de Belgique was established in 1850, and by the 1880s its note designs reflected the conservative graphic conventions of Belgian state printing — engraved in-house rather than contracted to the major foreign security printers that handled much of continental Europe's paper currency at the time. P#60 belongs to a period when Belgium was navigating the Latin Monetary Union's bimetallic tensions, and the 50 Franc denomination carried real transactional weight in daily commercial settlement.

Watermarking was the primary security measure — no serial numbering system of the complexity that would appear in later issues. Known examples show significant wear consistent with active commercial use rather than hoarding.