Dating Bottles Seams
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The Seam Method - of Dating of Glass Bottles
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THE SEAM METHOD - OF DATING OF GLASS BOTTLES ; 1840 - 1860* Seam verily goes over the shoulder : 1860 - 1880 Seam rises onto the neck of the bottle 1880 - 1900 Seam completely goes up the neck : After 1900 Seam rises completely to the top of Bottle
Bottles with these diagnostic mold seams in evidence were made by either semi-automatic or fully automatic bottle machines and virtually always date after ~1900 (for wide mouth bottles and jars) and after ~1910 for narrow bore bottles (Miller & McNichol 2002) .
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There are three keys to help with dating most bottles : Side seams : None: bottle may be free blown, in which case it has a very uneven shape and dates before 1860 . Or the bottle may have a nice even shape, but was spun in the mold to smooth out the seams ; a practice common around 1900-1920 .
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Bottle Dating Guide . There are three kinds of bottle bases . Open pontil which is most likely to date from 1860 or earlier . Iron pontil which usually dates around 1840s to 1870 . Smooth base from 1870 to current . Note: This is just for a reference guide . The mold seam may not be able to provide a 100% accurate dating . Some glass companies may . . .
Specifically, just one or two very small air vent bumps on the front and back shoulders (cylindrical bottles ) or the body shoulder corners opposite the vertical side mold seams (square or rectangular bottles ) tend to be the earliest (mid to late 1880s through the 1890s) with multiple air venting marks scattered around the bottle , including those integrated into the embossing pattern, side mold seams , and/or on the bottle base, being the latest dating , i .e ., mid to late 1890s to the end of . . .
Bottles were so widely used for so many purposes and dating them can be a frustrating experience for the novice collector . Seams are a reliable guide to age due to changes in how bottles were made . When bottles were free blown into molds, the bottle was made first then a lip was added . Since the lips were made last, they have no mold seams .
Bottle venting marks can be a very useful dating tool for bottles manufactured bottle the late 19th century . Close inspection of both bottles shows that neither have air venting marks anywhere on the bottle . This is dating with the flattened embossing as air vented molds allowed for the production of bottles with more distinct "sharper" embossing .
Perhaps one of the most common ways, though, of dating bottles is by looking at their mold seams . As glass bottles went from being free-blown to being mostly mechanically produced, mold seams have gradually extended up the sides of bottles .
Dating antique bottles requires knowledge of the evolution of bottle technology and the ability to research manufacturers and bottling companies . 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 .
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Dating Bottles Seams
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