This is an Eagle Prestige Green Stripe in the wider size that comes with a 14 karat gold Number 6 nib, c1939. It's open showing the clear cylindrical ink chamber that attaches at one end to the nib section and has a short rubber sac on the other. This unit does not touch the inside of the barrel. There are two grommeted holes in opposite sides of the barrel to allow airflow around the ink chamber to keep it from overheating. The end cap is removed to show the paddle-like lever that squeezes the ink sac. It has a Number 6 14 karat gold nib and is about 5 3/16 inches long capped.