2008 canada 1 cent, error from machine or man made?

is this man made or an error made when being minted?

circle with smaller circle a little deeper inside of it.

 

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Pmd

 

1 cent canada error

what does pmd mean? thanks

 

Post mint damage.
It meas the damage was done after it was minted so it is not a mint error.

 

ok thanks. i wasnt sure , i held on to the penny any way cause you never know what you can find in a roll, i love roll hunting. thanks