Dating o i bottles
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.
One can find quite a bit of information on my web site and across the Internet about dating bottles based on whether the mold seam goes up and over the lip or if the bottle has a 'pontil' on the base.
The following charts and pictures on the dating bottles pages listed below should help.
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.
Beginning collectors often confuse an Owen's ring with a pontil mark and it is easy to see why this happens.
The pictures below are from two early machine made medicine bottles.
Dating antique bottles requires knowledge of the evolution of bottle technology and the ability to research manufacturers and bottling companies.