interesting nickel - error or pmd?

I got this shield nickel with a group and am trying to decide what it is and what could have possibly made it look like it does today. Got any ideas?
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I got this shield nickel with a group and am trying to decide what it is and what could have possibly made it look like it does today. Got any ideas?
Comments
Looks like a clumsily filled hole
Not so fast speed racer. Looks like there may be some die striking within that 'hole'. This might be more interesting than PMD.
Close-up photos are nice, but also show both sides of the whole coin.
That will always help in diagnostics.
Here you go
Well it looks totally different in that photo.
PMD
Pretty cool. To me, looks like a puzzle piece sunk downward from its original position.

If you squeeze the arrows together, the piece would be back in place.
How it was formed is the question? PMD? Probably.
"Jesus died for you and for me, Thank you,Jesus"!!!
--- If it should happen I die and leave this world and you want to remember me. Please only remember my opening Sig Line.how was it formed?
look at the other side. pressed out with something.
PMD... As to the how or why? I have no clue.... but definitely not of mint origin. Cheers, RickO