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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.
However, without having more of the glass, I am unable to narrow that down to a specific year.
If that was the end of it, this would be a pretty lame blog post, but as it stands I am a fairly curious person and couldn't help digging a little deeper.
This provided me the opportunity to observe a large sample of amber beer bottle bases from the 1933-1941 period.