Banque Nationale, Specimen 100-Francs, undated (1961), multicoloured, Kasavubu at left (P.6), Specimen 500-Francs, 1961, lilac, mask at left (P.7), Specimen 1000-Francs, 1964 (P.8), and Specimen 10-Makuta, 1970 (P.9), red SPECIMEN overprint, about uncirculated, ink numeral on second note, scarce (4)