This is a pretty antique covered butter dish. I believe that this piece was manufactured by McKee Glass Company. I am NOT sure. I could not find another one, or another piece with the same design. If you know what the maker / pattern is, I would love to hear from you.
It is in good condition. It does have little flakes on the inside of the rim, where the top sits. They are tiny, but are there. I took photos, and if you have questions, please e-mail.