Purex bottle dating
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).Most bottles from the late 1940s into the 1950s and 1960s have two-digit date codes.On many bottles, a single-digit date code along with the diamond/oval/I mark may indicate the 1930s.From information compiled in Bill Lockhart’s article (link below) on Owens-Illinois’ date code markings, it appears that, on containers with this earliest trademark, if a single digit date code (such as “O” or “1” placed to the right of the logo) the chances are very good the bottle in question dates from the 1940s, especially the 1940-1947 period.
Within a year or two, most glass insulators produced at Muncie were carrying date codes.
(Thanks to Ken Rudd for submitting this photo)." src="https:// alt="Base photo of amber Dad's Root Beer bottle, carrying the "old" Owens-Illinois mark, but with an unusually late 1960 date code! " width="300" height="258" srcset="https:// https:// https:// sizes="(max-width: 300px) 100vw, 300px" / The mark “O-I” has also been in use for some time in very recent years (but I’m not sure when it first appeared on containers).