It's a Carter's nib in a plastic holder, and the whole thing is 3.5 inches long. Carter's was a very old brand, dating to 1858 and located in Massachusetts. It made pens until 1932 and then concentrated on making ink.
The plastic barrel reads "Carter's" and "Made in U.S.A.," and the number 11. The nib reads "Signature 6 Made in USA."
I thought it was a salesman's sample, but I've since seen several on the Internet advertised as short dip pens, or as signature pens ... perhaps something you kept on your desk for people to sign items when they didn't have a pen of their own.
Whatever it is, at $8.00, I couldn't leave it behind. It's never had ink on it, but the barrel is rather cheaply made, and the flashing hasn't been polished off.