1957 D Lincoln with weird D mark

Okay I posted this because I have never seen this before.any ideas.

 

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That's weird, I think it is what is referred to as PMD or Post Minting Damage, it is still weird...

 

definitely different.

 

I wonder if you scratched a letter or picture on a zincoln and treated it with acid, could you get something like this...BTW, what's the year?

 

It's a 1957 D/D. It has two Ds. Or maybe that "D" after the N isn't a D.

 

Is this second "D" next to the N raised above the surface or flush with it?
It looks raised in photo.
This is quite odd, and the only thing I can think of is that an inpactment from the letter D fell out onto this coin. Could you show photo of full coin?

 

yes it is raised, I will post the full coin when I get home

 

Appears to be a residue, it's not a MM.

 

I put acetone on it and it didn't do anything.Here are the pics after i did that. Any one have idea what I should do.

 

Lost earring.........

 

that sure is an odd one.