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The punty rod was used to hold the hot bottle while the lip was formed and finished.
The punty rod was dipped into hot glass and attached to the base of the bottle by one of the helpers.
One of the most important clues to the age of a bottle is the style of the lip.
In the picture below are shown a number of lip styles common during the last century.
Although glass bottles have been made for a few thousand years, it was not until the 19th century that bottle use became common, coinciding with the industrial revolution. The earliest bottles were hand-blown by a glassblower with a blowpipe and lack seams.Recycling was very common until the mid-20th century.The lettering “Federal Law Forbids Sale or Reuse of This Bottle” indicates a liquor bottle made from 1935 to the 1960s. Having written extensively on North American archaeology and material culture, he has contributed to various archaeological journals and publications.Is the base indented with an irregular to round pontil scar?This, and no mold seams, is another indication of a hand-blown bottle.
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Check for lack of bubbles and uniform glass thickness.