One approach to helping beginner identify their old bottles involves show them the bases of old bottles.
Bottle dating machine
-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.
Please be aware that in order to gain the maximum information about any particular bottle (e.g., dating, typing) the user must usually must review a number of pages within this website.
Unfortunately, the complexities of precisely dating bottles is beyond the scope of any simple key.
To return from other accessed hyperlinks, use the back arrow on your browser.
If a user needs to refresh themselves on the terminology used to describe the various parts of the bottle, click on Bottle Morphology to view a pop-up page of physical bottle feature definitions.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.This page and associated sub-pages allows a user to run an American produced utilitarian bottle or a significantly sized bottle fragment through a series of questions based primarily on diagnostic physical, manufacturing related characteristics or features to determine the approximate manufacturing age range of the item.As Berge (1980) noted in referring to bottles, the "..of manufacture of glass containers provides observable attributes which seem to be very useful in a classification of these artifacts." Thus, this page.Beginning collectors often confuse an Owen's ring with a pontil mark and it is easy to see why this happens.