American Pen Company

American Pen Company makes a series of fountain, ballpoint, and rollerball pens. The fountain pens take standard international or long standard cartridges. Any piston converter that is 75mm in length should also fit their fountain pens. Their ballpoint pens will take any standard Parker style G2 or D1 refill. Their rollerball pens take a Schmidt P 8126 capless rollerball refill.