Dating old bottles jars

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But the molds where rather roughly shaped and the extra amount of heating material needed to liquefy the glass made the method of casting unsuitable for the production of higher numbers of any containers made of glass.

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Bottles with Labels and Embossed Lettering Check for embossed lettering.Bottles With Mold Seams Check to see if seams go all the way from the base to the lip.If the seam disappears in the neck, then the bottle was probably “blown-in-mold,” and dates circa 1800s to 1915.Until the 19th century the method of blowing a piece of molten glass with a pipe and some other simple devices into the shape of a bottle was the only way to produce wine bottles.There was of course the method of casting, where you simply heated the glass to a higher temperature and then let the liquid glass run into a mold where it cooled down.

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