This is a great glass oil lamp in an unusual size.  The pattern is the fishscale base by the Dalzell, Gilmore and Leighton Company of Findlay, Ohio.  The lamp measures 8 1/2" in height to the top of the font and 18" if you include the clear glass piecrust top chimney by 5 3/4" in diameter at the base.  The lamp has nice brass burner stamped "Bridgport Brass Co" on the thumbwheel.  The lamp is in excellent condition with a makers flaw on one side of the font.  One of the largest Findlay lamps I have owned.