Table of contents. Click here to move directly to the list of machine-made dating questions. Machine-made bottles will exhibit most or all of the diagnostic characteristics explained and illustrated below. It should be noted that features 1, 3, 4, 5, and 6 are primary indicators of machine-made manufacture. Feature 2 mold seam diameter is not as strongly diagnostic as the primary indicators as mouth-blown bottles sometimes can have very fine mold seams. Feature 7 describes a couple glass related features that are quite consistent in machine-made bottles, but not diagnostic, i.
DATES of Owens-Illinois Glass Company BOTTLES
How to Date Owens-Illinois Glass
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How To Tell The Age Of A Glass Bottle (Identify Old Bottles)
When visiting an estate sale , shoppers are often intrigued by antique bottles. The best place to start is with knowledge of production techniques and strategic markings. When determining the approximate age of antique bottles, the first thing to know is how the glass bottle was produced.
I am here to clarify a bit of the mystery. Usually, the symbols are a logo for a company, and the numbers a code for where and when the particular glass item was produced. Each glass making company has their own method of labeling their products. With this hub, I am going to focus on the methods used by the Owens-Illinois O-I Company, and show you how to date your glass finds using the symbols and numbers indicative of the O-I company. I am by no means an expert on the numbers, nor am I an expert on how to date glass using the numbers, but I have done a lot of research on the subject, and I am relaying the information I have acquired along my internet travels.