Dating old brown bottles

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Is a pontil mark present along with disappearing side mold seams? Do the mold seams disappear in the neck, but the bottle lacks a pontil mark?Blown-in-mold bottles without pontil marks date circa 1860s to 1910s.One approach to helping beginner identify their old bottles involves show them the bases of old bottles.The picture below at the left shows an iron pontil on the base jof a historical flask circa 1865.

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The third picture shows the base of a milk bottle from just after the trun of the century.Is the base indented with an irregular to round pontil scar?This, and no mold seams, is another indication of a hand-blown bottle.By the mid-19th century, embossed lettering and marking on bottle bodies and bases, denoting manufacturers and products, made more precise dating possible. Is the bottle highly symmetrical, but lacking mold seams?In addition to technology, products and manufacturers, certain types of glass colors will also aid in dating. This type of bottle was probably dip-molded and dates after circa 1820.

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