This is a green, Anchor Hocking, Colonial, aka Knife and Fork pattern, claret wine stem. This pattern was manufactured for only two years, between 1934 and 1936. This piece fluoresces when placed under a black light.
I have sixteen (16) of these stems available 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.