Dating glass containers incorporated bottles

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

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.

Owens-Illinois continued to have the great majority of insulators marked with the “HEMINGRAY” brand name, with very few exceptions in later years.

Other brand names used by O-I on insulators include “Lowex” and “Kimble“.

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