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For more detailed discussion on Owens-Illinois Glass Company and the date codes, plant location and mold codes used, check out this comprehensive article written by Bill Lockhart and Russ Hoenig: The Bewildering Array of Owens-Illinois Glass Co. Click here for one of many pages from O-I’s official website.To return to the main Glass Bottle Marks page, please click here. Please check out my summary page on Sea Glass / Beach Glass.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).

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(For more info, please check out the extensive article by Bill Lockhart and Russ Hoenig; link farther down on this page).

The second mark was phased in during the 1950s with the removal of the diamond.

IMPORTANT NOTE: Many liquor bottles and flasks made by Owens-Illinois have a DIFFERENT mold code configuration on the base, as compared to the way the numbers are arranged on most other types of bottles they made.

Typically, it is marked with a number called a “Liquor Bottle Permit Number” followed by a dash and a second number which is the date code.

Hemingray was a prolific maker of electrical insulators (of many types and sizes) for power lines, telegraph, telephone and other uses.

Within a year or two, most glass insulators produced at Muncie were carrying date codes.

The diamond/oval/I mark is by far the most common identification mark on glass containers found in trash dump sites in the United States from the 1930s, 1940s, and 1950s.

(The second most common mark encountered is probably that of the Hazel-Atlas Glass Company.) Owens-Illinois took over operation of the Hemingray Glass Company factory, located in Muncie, Indiana, in 1933.

For a page with some of the principal plant code numbers used on bottles, courtesy of Dick Cole (, click here .

(That list is several decades old and does not cover all of the recently started plants).

This is the very latest instance of use of the “old” O-I mark that I am aware of.