Vintage Sheaffer SLIM Skript cartridges Blue-0Black
A few Sheaffer fountain pens from the 1980s use Sheaffer Slim Cartridge II refills. These cartridges are longer and slimmer than the regular Classic cartridges.These cartridges are very old -
You can test to see if the ink flows well. You can rinse them out with water and a syringe Then fill them with fresh ink.