1995 d cent under the L

in liberty - how does this happen?

 

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The copper plating has had a hole punched in it and the zinc core is beginning to corrode.

 

Funny how much it mimics a MM serif and all

 

It can't be an MM serif. The mint stopped adding mintmarks to the working dies after 1989. If it was indeed a misplaced mintmark (which it isn't), it would be present on the master die, and therefore many working dies, and there would be millions of coins with the "misplaced mintmark".

 

Which is why it seems so unusual, and this does not seem like a corrosion coin.

 

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That raised stuff under the L is cu colored shiny and flat as if it was smashed in by the field. Doesn't appear rounded like any blister, and I don't see damage there.