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The letters ABM (automatic bottle machine) are used to refer to these bottles.In the photograph there is a smaller ring and then a larger one (not as clearly visible). Both rings are very symmetrical and did not leave a rough mark like the punty rod.In the picture below are shown a number of lip styles common during the last century.
For the period from 1870-1910 bottles had hand tooled lips and smooth bases.Beginning collectors often wonder how to tell the age of a particular bottle.One of the most important clues to the age of a bottle is the style of the lip.Molds were designed with a particular base called a "key mold" this mold left a distinctive mark on the base of bottles made between 1850-1870.Key mold bottles can be found both pontiled and smooth based As mold making technology progressed the seam across the base of the bottle disappeared.
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The punty rod was dipped into hot glass and attached to the base of the bottle by one of the helpers.