This is a vintage 1980's Lamplight Farms Oil Lamp (also known as a "hurricane" lamp) - Made by Lamplight Farms, Menomonee Falls, Wis. - U.S.A. embossed on the bottom and also on the brass thumbscrew.
Bottom glass is a ribbed design tan or cream color - clear glass chimney Stands 13" tall complete x approximately 5 1/4" wide - I do believe it was ever used.