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.Dating antique bottles requires knowledge of the evolution of bottle technology and the ability to research manufacturers and bottling companies.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.) to the specific dating questions on the Bottle Dating page are included so that a user can reference the necessary portions of that page.
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.
Hopefully this database will be of some help to those who are attempting to assign an approximate date range to a particular bottle, assuming it carries an identifiable glass manufacturer’s mark. Co.” Also, the abbreviation “Co” (Company) sometimes may be found embossed with either an upper- or lower-case “O” on various bottles made by the same manufacturer.
be a glass manufacturer’s mark and so may not be listed here. Many bottles carry only a number (or numbers) on the base.
Is the base indented with an irregular to round pontil scar?
This, and no mold seams, is another indication of a hand-blown bottle.