This sharp insulator is the M moulded HGCO PETTICOAT.The colour is an outstanding pure blue with several large bubbles in the glass and one huge bubble around the side that is 1" long X about 3/8" wide and also has a nicely flaired skirt. Condition is VVNM.Displays perfect. Book is $100 range. $57 delivered. Well, how about $22 and you pay the shipping.