This is a very pretty antique miniature kerosene lamp in gold mercury decorated glass with a clear glass 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 7 3/4" in height if you include the clear glass chimney.  The pattern is pictured in the Smith - Miniature Lamps I Book on page 78 Fig. 121.  Condition is excellent with the gold mercury decoration showing some wear in spots.