100 Francs / 20 Belgas bicolor red and green

Bradbury Wilkinson produced this note in occupied Europe's shadow — the Banque Nationale had relocated key operations and printing arrangements to Britain after the German invasion of May 1940, making London-area presses the practical alternative to compromised continental facilities. The bicolor red-green combination was a deliberate anti-counterfeiting measure; German forgers working in occupied territories had demonstrated considerable skill with single-color intaglio reproduction, and the two-color registration requirement raised the technical bar substantially.

Vloors designed and Minguet engraved for the same institution across multiple interwar series, so the collaboration here carries continuity from pre-war Belgian note production. Poortman's reverse work is the less-studied contribution.