This is a beautiful antique miniature kerosene lamp in amber glass with amber chimney in the Acorn pattern by the Beaumont Glass Company.  The lamp measures 3 1/2" in height to the top of the font and 9" in height if you include the amber glass chimney.  The pattern is pictured in the Smith - Miniature Lamps I Book on page 78 Fig. 121.  Condition is excellent.