Penny with odd rim

[Del Norte]

Found this while searching a bucket of cents. Looks like 2007, the rim is rounded and steel color. Any thoughts on this?

 

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[jewelerguy]

the 'steel' color is the zinc core of the coin. (modern pennies are only copper plated) it is most likely rounded from rolling around in a clothes dryer for a long long time

 

[Del Norte]

the 'steel' color is the zinc core of the coin. (modern pennies are only copper plated) it is most likely rounded from rolling around in a clothes dryer for a long long time

Thanks. I will let it go back to the wild so others can wonder why it looks like that.