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Helwig & Leitch Baltimore MD. Question about dating similar bottles with slight differences.

CanadianBottles

Well-Known Member
May 24, 2014
2,306
48
They were made in different molds. If they were making a large number of bottles they may have had multiple molds going at the same time, and I imagine they weren't terribly concerned about making sure each mold was identical. That's assuming that the two are the same age, if not it's possible that one mold was a replacement for the other.
 

slugplate

Well-Known Member
Jul 7, 2016
412
63
Sometimes molds just wear out or get damaged and it's replaced. However, using one mold for mass producing bottles was very impractical and so many more were used. Thus, I'm pretty certain they had more than one mold which may account for the base marking difference.
 

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