Dime minted without the copper core???

Hello All!

I found this while looking through some customer rolled dimes from my local bank and was very intrigued about its origin/authentication. Any ideas?

 

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It had copper at one time, but someone gave it an acid bath.

 

I agree, acid will eat the copper first, and leave the rest, that is what happened to your coin.

 

Tell me more about this acid that eats copper in preference to nickel. Nickel's a more active metal.

 

I think that nitric acid is the culprit.

 

If the copper core had not been present at minting there would of not been enough material between the dies to make any impression on it.