-The glass is clear (colorless) with just the slightest "straw" tint when looking through the thick portion of the base.Dating antique bottles requires knowledge of the evolution of bottle technology and the ability to research manufacturers and bottling companies.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.The bottles used for illustration are a small but diverse assortment designed to give users guidance on how to work a bottle through the dating information to answer the Homepage's primary question #1 - What is the age of the bottle?) to the specific dating questions on the Bottle Dating page are included so that a user can reference the necessary portions of that page.The middle picture shows an open pontil on the base of a cylindrical medicine bottle.
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?
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.
This bottle dating "key" is a relatively simple "first cut" on the dating of a bottle.
Although glass bottles have been made for a few thousand years, it was not until the 19th century that bottle use became common, coinciding with the industrial revolution. The earliest bottles were hand-blown by a glassblower with a blowpipe and lack seams.
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?