Weird dime

[RUSSIANPAUL]

Did a box of dimes this week, and saw a dime which was smaller then the rest and looked like the ridges were missing from the side. I was thinking maybe it was a penny, but no it was a dime indeed.
I believe i have seen someone else post that they found one like this before, but i may be mistaken. Do you guys know if this is an error, or its just been heavily worn?
Hopefully the picture can really tell what it looks like in comparison to a regular dime.

 

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Looks like one of the dimes that spent some time rolling around in a dryer.