Banque Nationale de Belgique, a single piece of watermarked paper for 100, 500 and 1000 Francs (or 20, 100 and 200 Belgas) issue of 1943, glued into blue card frame, annotations on paper, as produced, rare, this being the only example in the Portals archive
BNB B571-B573, Pick 123-125 £60-£80