Pontil scars on dating glass Sex chat3d onlin
The disk-like mark is sometimes confused with a pontil.the pontil is actually broken glass where the metal rod used to hold the bottle while the lip was form was broken off leaving a sharp scar.A pontil rod held the nearly molten bottle during the final stages of manufacture.The scar was left when the pontil was detached from the bottle. This will be shallower, wider and more perfectly circular than a pontil mark.
This is the base of the bottle whose lip is shown above left.Bottles with suction scars were made in an Owens Automatic Bottle Machine and date after 1903.The Owens machine revolutionized the bottle industry. Most bottles with embossed lettering date from the late 19th century and later.The food and household product industries on the other hand widely adopted the screw cap quickly.One unique closure to the late 1930s was a three point screw top.