Only now do I remember that in late 1980s there were Faber-Castell Albrecht Dürer leads for clutch pencils, 5.6 mm in diameter, similar to these (a screen grab as the link doesn't seem to work properly):
The colours were the same as in pencils: 101 White, 105 Lemon cadmium, 107 Lemon, 108 Canary yellow, 113 Light orange, 115 Dark orange, 121 Light geranium red, 124 Rose carmine, 126 Dark carmine, 144 Light cobalt blue, 147 Light blue, 148 True blue, 151 Prussian blue, 155 Night green, 167 Sap green, 168 Moss green, 170 Apple green, 175 Dark sepia, 176 Van Dyke brown, 183 Gold ochre, 187 Burnt ochre, 190 Venetian red, 191 Pompeian red, 199 Black.
No violet, no bright green! I'm lucky enough to have one of each (except white and black) and their pigments may not be identical with the pencils of that time as there are some differences.
Koh-i-noor Hardtmuth has similar sets (Mondeluz water-solubles and Polycolor non-solubles) although with 3.8 mm leads:
- along with a now discontinued Caran d'Ache Museum 18 color set