Weird texture US Quarter

[FingerChili]

I got this in change, not detecting or anything. What's wrong with it?

Thanks

 

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[port ewen ace]

victim of tumbling

 

[FingerChili]

Like a rock tumbler?

 

[Professor of Engineering]

Metal "detectorist" found it and cleaned it by tumbling.

 

[FingerChili]

I'd also air quote "cleaned" since they just made it worse.

 

[ILikeMoney]

Acid wash

 

[WaterScoop]

Sand blasting