Our first example to the right (Exhibit D), fortunately for me, is extremely easy to determine the date of production.
Since 2063 has yet to pass, and the company did not exist in 1863 nor did it use that symbol prior to the 1950's, the only possible year of production is 1963. I am unsure of whether or not this particular example follows the general trend of date code to the right of the symbol. If we assume that the 7 is indicative of a year, it could mean anything from 1957 to 2007.
It is possible that this date will be updated in the future, once the company announces the actual date.
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.
The plant code is of no use either to help narrow down the date.
The number 17 is for a plant in Clarion, Pennsylvania which has been in operation since 1932 and is still presently producing bottles.
By the time 1940 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 1940 -1949.