Easily confused with a Parker 51, this Parker 17 is actually a British model. Instead of a metal cap, such as the 51, this one has a plastic cap made of the same lovely green material as the barrel. It also sports a wider cap band and a tail jewel. You will see some scratches that were mostly made by the cap in its closed position. There is a tiny dimple in the wide cap band. The original pli-glass ink sac still works well. We get a kick out of how the sac protector instructs to squeeze the sac 5 times just to fill it. Early aerometric 51s were imprinted to squeeze 6 times and laters ones said to squeeze only 4 times. You will write a very smooth fine line with its 14k gold nib.