This is a pretty green Anchor Hocking, Colonial aka Knife and Fork pattern, whiskey shot glass. It could also be used for a toothpick holder. This pattern was manufactured for only two years, between 1934 and 1936. This piece fluoresces when placed under a black light.
I have eleven (11) of these for sale, each one separately. They are all in very good condition.
Take a look at the pictures, and if you have questions, please e-mail.