1990-D Roosevelt Dime Underweight 1.8gr

I found this Dime with a very particular error,.... Underweight 1.8gr and just the copper-core exposed, nothing else.
This is the only thing I have found about another 1997-P Dime with the apparently the same error. ( https://www.coinworld.com/news/us-c...ights-undercut-solid-coreless-dime-.all.html#) So far I cannot figure out what really happened to this dime.

Awaiting your responds,.... thanks!!

 

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The lack of reeding on the edge and the overall eroded appearance point to this being a coin that has been soaked in some kind of acid.

 

In my opinion, it looks like the coin has seen some acid.

 

"Acid?" Excellent!!

 

I agree to acid or some type of corrosive chemical. Your Dime is not a Mint Error

 

or a metal detecting salt water find.

commonly found

 

Agree with the above - that edge looks like it may have been polished away with a buffing wheel

 

Thank you all, for a moment I thought I was heading tomorrow to a Maserati dealer!,... ,... Have a great day!