New and Genuine Oki Printhead for Oki Okidata ML320 Turbo Printer and Oki Okidata ML321 Turbo Printer 
This Oki printhead is a new and exact OEM replacement for your old printhead. This printhead fits the Okidata ML320 and Okidata ML321 Microline dot matrix printers exactly. You do not need a technician to replace this printhead - it is a user-replaceable printhead with an average lifetime of 200 million characters in utility mode at normal 25% duty and 35% page density. Use genuine OEM ribbons for best printhead life.