Is this an error?

[Detectorinator]

I recently pulled this dime from a box and can't tell if it is a mint error or damage by someone grinding it down. I've never seen anything like this before. Can anyone advise?

 

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[CoinFetcher]

That damage was done after it left the mint.


Somebody took an electric Dremel tool to it.

 

[BuffaloBoy]

I am no expert on errors nor have an opinion on this one, but it's a very cool coin, thanks for sharing with us!
hh
buff

 

[sagittarius98]

It cannot be struck on one side only, so it is PMD.

 

[enamel7]

Definitely pmd.