An Embossing question (s)

[Patagoniandigger]

Normally the embossings on circular bodies are well done but is ferly common to see a deformation in those cases the embossing run from side to side getting to the mold seams.
I understand that it's made at porpoise to allow the mold open and avoid it erases the embossing.
The first two images (1920s soda bottle ) show this point very clearly.

 

[Patagoniandigger]

 

[Patagoniandigger]

Even it's possible to see this deformation a little in new bottles.

The following pictures show close up details of different bottles. This question is not so clear on them.
This is a 1900-1910's beer bottle. Iridiscent amber glass.

 

[Patagoniandigger]

Next two belong to another beer bottle. 1900 circa applied top.

 

[Patagoniandigger]

Another beer 1900-1908
Like others there is a shadow that gets to the mold seam but only at the right side.

 

[Screwtop]

I have a few examples of this, even double dies.

 

[Patagoniandigger]

I have a few examples of this, even double dies.

I can expla how a double die was produced but the "shadow" in only one specific point continues being a mystery to me. For example the quotation marks and the "a" above.

 

[Patagoniandigger]

A close up of a Morton Fine Table Salt jar

from England that dates 1900 circa.
This is another example of the "shadow " that runs from the F to the very mold seam.

 

[Patagoniandigger]

This is a clearer picture of the same jar