I'm going to agree with CC here. Not that I'll add
any expertise, but it's
simply fun to approach the question of "post-mint" damage from an observational angle.

To
test the "post-mint damage" idea, we might ask: "does the coin show evidence of a foreign object forced directionally under the lamination? To that end, it might be good to ask a few more questions:
If
a. points to the foreign object in question, we might ask how this material was forced into the coin, as it appears under
both the lamination
and embedded within the field before the fold of metal.
If the lamination folded back on itself due to an object forced into the coin, then we might reasonably conclude this force was directed perpendicular to that fold of metal (
c.).
Is there any evidence in the fields before the lamination to suggest an object forced into the coin, such as directional gouging)?
However, if the object was forced in the direction as shown by
c., how does this explain that bulge (
d.) perpendicular to this force?
And why does the object stop
cleanly at the lamination layer and not break through to the other side? That's a
very neatly applied force, imo.
Since I do not see how post-mint damage explains what I see, I have eliminated it as a possible cause. But that's just me.
