The symbols, therefore, are quite faded. There is no exact year in which production of the symbol stopped, as various plants ended use of the mark at different years. Now, I know from the use of the symbol on the glass that both pieces pre-date the mids, but is there a way to narrow that down? The general rule when dating glass with the O-I symbol is the number to the left of the symbol is the plant code, and to the right of the symbol lies the date code.
Other numbers, such as the 7 in Exhibit C, are specific to the production plant, and letters, such as the A in Exhibit E, usually stand for the glass model e. In other words, they're not very useful for our purposes. The number on the right is our year code and what we are most interested in.
The year code for Exhibit C is clearly a 9. In conjunction with the relative dates of the symbol, we know that the 9 could either stand for or is possible, but very unlikely. By the time came along, the company realized year codes were beginning to repeat, so in the 40's they implemented adding a period after the date code to indicate years By the mid's most plants switched to using a two number date code such as 46 for a production year of However, use of the period after the one number date code in the 40's, and use of the two digit year code was inconsistently used by various production plants, therefore the 9 alone doesn't always mean with absolute certainty.
Lindsey, B There is one factor, though, we have yet to consider: Resources became limited as many industries focused on manufacturing supplies to support the war effort.
As a conservation measure during the war, the amount of glass used for many bottle types was reduced. You can't really tell from the picture, but the green glass in Exhibit C is quite thick, thicker than anything we would see today, which leads me to believe that the glass was indeed manufactured in , and has been sitting in the creek ever since, waiting for me to find it.
Owens-Illinois Glass Company
Exhibit B is another story all together. I only have half of the picture. The number in that picture could either be a 6 for the plant code, meaning it was made in Charleston, West Virginia, a plant that was in operation from - Society for Historical Archaeology or it could be a year code of 9.
If it is a year code, the thickness of the glass and the lack of a period after the 9 suggests a manufacturing date of They axed the diamond, and instead were left with a simple I inside of an O see pictures to the right and below. The general trend, however, remained the same with the plant code on the left of the symbol, and a date code to the right. Our first example to the right Exhibit D , fortunately for me, is extremely easy to determine the date of production.
Since has yet to pass, and the company did not exist in nor did it use that symbol prior to the 's, the only possible year of production is However, this next piece of glass is not so easy.
DATING OWENS-ILLINOIS BOTTLES
I am unsure of whether or not this particular example follows the general trend of date code to the right of the symbol. That 7 placed there could literally mean anything. If we assume that the 7 is indicative of a year, it could mean anything from to The plant code is of no use either to help narrow down the date.
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The number 17 is for a plant in Clarion, Pennsylvania which has been in operation since and is still presently producing bottles. However, the A to the right of the 7 tells me that this piece of glass has a high probability of either once being a Coca-Cola bottle or a Pepsi-Cola bottle. If that is the case, this piece of glass may be our exception to the rule and the 7 to the right of the symbol may not be a year code at all.
Coca-Cola and Pepsi-Cola didn't always adhere to the Owens-Illinois policies, and often had their dates on the heel, and not the bottom, of the glass. Society for Historical Archaeology However, what we do know is that Pepsi and Coke now come in plastic bottles or aluminum cans. They started the switch to plastic in the 60's and 70's. That narrows down the date from to if the 7 is indeed a year code. By comparing it to the glass, Exhibit E is more weathered.
It is frostier and more scratched and appears to have been in the water longer than Exhibit D. This leads me to believe that the 7 stands for However, that is simply my best guess and not a certainty. I know this was a long post, but I hoped you have all learned as much as I have. My sources are listed below, feel free to check them out yourself for more information on the subject.
Dating owens illinois bottles
Society of Historical Archaeology, Wikimedia Foundation, 22 Oct. Sign in or sign up and post using a HubPages Network account. Comments are not for promoting your articles or other sites. I found a glass jar with an "I" in an oval, factory code 10 and year code That doesn't make sense. A factory code 10 indicates that it was made in the 30s, but a 71 date code says it was made in What am I missing? If the glass is from then the I may have faded away over time, especially if you found it in the ocean. In Exhibit C, you can just barely make out the I in the photo, so it might be the first part of the symbol to fade.
Also, Pepsi and Cola were known for not exactly following the Owens-Illinois companies rules and standards when it came to dating and stamping their glass bottles. For example, instead of a date code on the bottom of the bottle, Pepsi and Cola often printed their date on the side of the bottle, so they could have left the I out of the symbol. Are you sure the glass is from ?
From what I have researched, the company didn't start embossing glasses with the word 'Duraglas' until the s?
I found your article very helpful. Made at plant 3 in Not sure if there is a dot after the 4 as there are many dots in that area. However, the Duraglas inscription is quite clear but the diamond trade mark only appears to have a circle within and not an I. Other product and company names shown may be trademarks of their respective owners. The factory numbers did not change after the merger. After the diamond was omitted.
Trademarks & Manufacturers: Owens-Illinois Glass Company
The factory number was on the left and the date number was on the right. If one adds the date number to , the total was the date of manufacture. On a diamond-less mark, the number should be added to The mold number was located under the mark. I think that the system was begun at Owens because of the number of 2s, 3s, 4, and 6s which we find on Owens glass in the left position. Unfortunately they sometimes reversed the factory and date positions, so the practice was not very systematic between and
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