These variations in punctuation were common and probably reflected the whim of the mold engraver, thus having little or no importance (i.e. Some numbers served as date codes, or as some other type of internal code used by the factory.
for assigning date ranges) especially on marks of pre-1900 bottles. In the great majority of cases, bottles with only numbers on the base are difficult, if not impossible, to attribute to a specific glass maker.
The date you see on most beer bottles are not expiration dates but ‘pull dates,’ which are the dates retailers are instructed to pull beers off a shelf if they haven’t sold yet.
The beer inside hasn’t expired, but it’s not longer considered “brewery fresh” and most companies no longer want it to be sold.
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