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The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.Researcher/historian Tod Von Mechow has compiled a large quantity of in-depth information on antique beer bottles, including both pottery and glass bottles.I would encourage anyone interested in makers’ marks on beer bottles (and soda bottles) to check out his site…..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.
Another source of confusion was the common practice of engraving the “G” (especially in the 1880-1920 period) to appear very close in similarity to a “C”, the only difference between the two being a small “tail” pointing in a downward or “southeasterly” direction on the lower right-hand side of the letter G. I will occasionally be adding more data to these pages as I uncover more accurate information.
The info presented on this site is the most accurate I’ve been able to find at present, but any comments (pro or con), clarifications or corrections (preferably backed up with , but please be aware that I’m not an appraisal service, and I may not respond to queries along the general lines of “what is this jar worth?
” and “is this bottle worth the hassle of listing on ebay? Generally speaking, I may not be able to answer questions concerning bottles with only mold or catalog numbers embossed on the base.
I am striving to add more articles on this site relating to glass and glass collecting, both of a general nature, and addressing certain collecting “niches”, as time and energy permits! If it’s a question that is already answered somewhere on this site, then a *keyword search* will have to suffice (look along the top right-hand area of any page for the search box), and I may not reply with an individual answer.
I apologize if you write to me via email, or post on one of these pages and do not get a personalized reply!