Anyone else seen this before

I was coin roll searching and came across this

 

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Damaged by heat
We have seen more than a few here on CoinTalk

 

Hot hot hot as @paddyman98 Stated.
Welcome to Cointalk
Dave

 

I dont claim to know what the cause of this is. Nor do I understand why this can be considered an Error for Canadian coins and not US coins.
I have been told that this effect is cause by the coin being brushed by a Wire Wheel
mounted on an electric motor. Which can cause this effect to certain degree.
I am not sold on the idea that all coins like yours are PMD. And I do Not know of anyone that has all the answers.
http://coinsandcanada.com/coins-errors-varieties.php?error=rippled-coin&id=30.

 

The Canadian Rippled coin is understandable. But the Quarter in question is clearly damage.

 

I did not say the op’s coin was not damaged. But thank you for reiterating your opinion.