BELGIAN CONGO. Banque du Congo Belge. 500 Francs, 1945. P-18Acs. Specimen. PMG Choice Uncirculated 64.Specimen. Emission 1945 Overprint. This rare design is seldom seen in any form and when offered normally proof types are seen. This Specimen note sheds light on both the face and back design on banknote paper and shows with outstanding quality throughout. The design is highly intricate with detailed devices in multiple colors and ornate geometric lathe work at the borders and guilloches. This brown color variety is a bit more difficult to find.