Looks to me like a normal cent that spent some time in a corrosive situation - Coca-Cola, salty slush in the Canadian winter, metal-detector find in acidic soil.
I have been collecting wrong planchet Canadian errors for many, many years. I can't remember the last time I saw a legit wrong planchet error on a scruffy, off color looking planchet such as this one. To me, it looks as though it was exposed to harsh environmental conditions or acid that caused this appearance and weigh loss.
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