Dating glass containers incorporated bottles
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.many of the liquor flasks made by Owens-Illinois have the “Diamond and Oval with an I” logo embossed sideways on the base of the container.However, more research over the years has shown there was actually 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 which carries the “old” trademark on the base! 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.Illustrated among the pics on this page is the base of a bottle made at the Columbus, Ohio facility (plant #18) with a date code of “7” which in this case probably stands for 1937.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.Many millions of insulators were made at Muncie, up to 1967.
However, there are some exceptions to this general rule, and single-digit date codes were also used in later decades along with the later “I inside an O” mark (but without a period placed to the right of the code).
I don’t know how late the word “OWENS” was embossed as a trademark on the base of those medicine bottles.
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.
The “I inside an O” trademark The second mark used by Owens-Illinois Glass Company was phased in during the mid- 1950s with the removal of the diamond.
Julian Toulouse (Bottle Makers and their Marks, 1971), states this mark was used beginning in the year 1954.