1000 Francs

Belgium's post-WWI reconstruction period placed enormous strain on the Banque Nationale, and high-denomination notes like this 1000 Franc issue were central to financing public debt that had ballooned under German occupation. The franc itself was losing ground against gold throughout these years, a slide that would culminate in the Belga reform of 1926 — meaning the later dates in this issue's range effectively mark the final years of the unconverted franc system.

Paper quality on this series is notoriously uneven; notes issued toward 1925–1926 show more pronounced foxing than earlier printings, likely due to wartime disruptions to raw material supply chains that still hadn't fully normalized.