Hm, that piece of Mason jar was manufactured as late as 1920. Crowleytown?s Atlantic Glass Works, Crowleytown, New Jersey were believed to have started this long series of glass jars. Here are some ways to tell exactly how to date glass jars approximately.
There are several ways to date an antique jar or bottle. Probably the most important is the presence or absence of a pontil scar. The pontil scar - a ring of glass or a black and red iron-like indention on the base of a bottle or jar - indicates that a glassblower held the item on a pontil rod (when the glass was hot) while the neck and/or lip was shaped and finished by hand. Typically, American pontil scarred bottles predate 1855 or so.
Another age determiner is the presence of mold seams. Many of the earliest bottles or jars were freeblown (that is, blown without the aid of a mold) therefore have no mold seam. Seams which stop short of the lip indicate that the bottle was blown into a mold then finished by hand by adding a top or tooling the lip into shape. Machine-made jars (dating after about 1915) have mold seams extending from the bottom up to and across the top of the jar.
Hope this helps!!
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