Once the likely bottle age or date range is determined, some examples of other places to look for more information is provided.: -It is about 9" (23 cm) in height and 2 3/8th inches (6 cm) in diameter.-It is made of thick, heavy glass for its size, weighing almost 1 lb.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.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.Even given these descriptions beginning often mistake a machine made Owen ring on the base of a bottle with a pontil.-There are molded (embossed) "swirls" on the shoulder and upper body of the bottle.-The glass is clear (colorless) with just the slightest "straw" tint when looking through the thick portion of the base.
The following charts and pictures on the dating bottles pages listed below should help.
I have put up pictures of the lips so that the readers can see how they mold goes all the way over the top as shown below. This is different than an older hand tooled, hand blown bottle.
The pressure from the automatic machine was strong and the molds fit tight leaving only a very thin line.
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.