These printers use the 51640M cartridge:
HP Color Copier 210
HP Color Copier 210 LX
HP CopyJet
HP CopyJet M
HP DesignJet 230
HP DesignJet 330
HP DesignJet 430
HP DesignJet 650
HP DeskJet 1200 C
HP DeskJet 1200 C-PS
HP DeskJet 1600 C
HP DeskJet 1600 CM
HP DeskJet 1600 CN
Riso-Corporation RJ 1100