Beautiful vintage Parker 51 pen here. It has a metal look with gold accents. The pen is marked made in USA with the number 50 next to it. The inside is marked Parker "51" with ink instructions following that.  The top of the cap has a beautiful jewel I believe. I question that because I do not know anything about pens. You'll be able to look and know for sure I imagine. That's why the ? mark is in the title.  The pen is being sold as is so it probably need some reconditioning. The gold needs to be cleaned up a bit as well. I do not know the ink color. See pictures for items condition and description