500 Francs

This long-running series spans the First World War without a break in numbering — the same basic plate design, engraved by Albert Doms from Henri Hendrickx's work, carried the Banque Nationale through the German occupation, the postwar stabilization crisis, and well into the interwar period. Notes dated 1914–1918 were issued under conditions of occupation finance and are considerably scarcer than their interwar counterparts, though often turn up with heavy fold wear from active use during that period.

The Tschaggeny/de Lantsheere signature combination was retired by 1914; the gap before Stacquet and Hautain signed on reflects the wartime disruption to normal banking administration.