1965 dime missing the rim?

[tttwism]

I found a 1965 dime that looks like it is "mushroomed". The whole rim is missing, like a groove around the whole thing. The top and bottom are still there. any thoughts?

 

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[sagittarius98]

Damaged after it left the mint.

 

[tttwism]

what would damage a coin like this? and be uniform all around?

 

[50cent]

PMD, and to answere your question, probably some angry man with a grinder/revolving sander in his garage. Maybe a science experiment? ah the possibilities!

 

[coinguy*matthew]

This happens when a coin is left in an acid bath too long because the copper is a softer metal than nickel it is eaten away first leaving the harder nickel.

 

[Iamrussell]

Find those all the time- I was curious as well as to what would cause it