This is a Ford Patent Pen of around 1935. Despite its unusual design, it's a practical pen and a daily user. Essentially, it's a syringe with a sleeve and an attached nib. Though it has a superficial resemblance to De La Rue's Onoto plunger-filler or Sheaffer's Vacuum-fill, it works in a different way. The barrel fills on the upstroke and the ink is transferred to the top of the barrel on the downstroke by means of a sliding seal which also permits the ink to flow to the feed. It's a robust design and relatively easy to repair.
Ford nibs are usually stiff but this one is semi-flex.
Great Pen Sem. I really enjoy using and collecting unusual pens.
Just a note about the edit in your post. I made your url into an actual link people can click on. I won't edit your content. That's a sacred cow to me.