Dating o i bottles dianne elise agron dating
On many bottles, a single-digit date code along with the diamond/oval/I mark may indicate the 1930s.From information compiled in Bill Lockhart’s article (link below) on Owens-Illinois’ date code markings, it appears that, on containers with this earliest trademark, if a single digit date code (such as “O” or “1” placed to the right of the logo) the chances are very good the bottle in question dates from the 1940s, especially the 1940-1947 period.There was a gradual changeover from the “old” to the “new” trademark on containers which occurred over a period of four or five years beginning in 1954 (with a few known exceptions—see note below discussing a bottle made in 1966 with the “old” trademark).Some bottle molds already in use were not re-engraved until as late as 1957, 1958, 1959, even, as mentioned, in 1966. “OWENS” appears on the base of some clear prescription bottles.
In addition to technology, products and manufacturers, certain types of glass colors will also aid in dating. This type of bottle was probably dip-molded and dates after circa 1820.
(Specifics on what a pontil looks like or how to tell the age based on the mold seam can be found in Bottle Basics.) While these two characteristics are often a strong clue to age, readers will be further helped by developing an understanding how the various categories of bottles changed over time.
To aid beginning collectors and those interested in bottles I have developed a number of bottle time lines.
A pontil rod held the nearly molten bottle during the final stages of manufacture.
The scar was left when the pontil was detached from the bottle. If the seams disappear in the neck, the bottle was probably "blown-in-mold" and dates circa 1820 to early 1900s.
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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.