This is a very pretty fingerhold emerald green glass oil lamp.  The pattern is Sweetheart or Queen Heart by the Dalzell, Gilmore and Leighton Company of Findlay, Ohio.  The lamp measures 3" in height to the top of the font and 11 1/2" if you include the clear glass chimney.  The lamp has a great brass burner stamped "Plume Atwood Fireside".  The lamp is in excellent condition.