BELGIAN CONGO. Banque Centrale du Congo Belge et du Ruanda-Urundi. 500 Francs, 1955. P-28b. PMG Extremely Fine 40.Printed by BWC. Watermark of lions head. One of five notes graded by PMG for this scarce variety, and this note is Top Pop. Good eye appeal for the assigned mid-grade. PMG Pop 1/None Finer.