50 Francs / 10 Belgas Type 1927 Trésorerie

The "Trésorerie" designation in the title is misleading — this was a full Banque Nationale issue, not a treasury note. The label stuck because the 1927 type was originally conceived as part of a broader monetary stabilization program following the catastrophic devaluation of the Belgian franc under the Poincaré-era pressures of the mid-1920s, with the belga unit introduced in 1926 at 5 francs to give the denomination scale a more stable anchor.

Anto Carte was a symbolist painter, an unusual choice for banknote design work. Minguet handled the intaglio engraving on the face; Poortman, a prolific engraver at the Belgian printing establishment, took the reverse. The series ran across more than a decade, overlapping with both the German occupation and the wartime government-in-exile in London.