CD 135 Chicago Insulating Co. purchased from Dan Culver. This piece has an excellent rock at the top of the dome with plenty of bubbles and fizz, despite a large and relatively deep thumbnail sized chip near the base (not visible in the photograph). This mold variation has three vertical dots below the groove and base embossing which reads "Chicago Insulating Co. Pat Oct..." with the rest of the embossing too damaged to be legible.