Would you call this error coin or whar

[Jyorsky]

Found this in roll today.
Could not find ant marking where it was punched in obverse side.....
What do y’all think?

 

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[xr7ator]

Just an older half that is beat up and seen much better days. Could very well be a digger that was cleaned to recirculate.

 

[Twitch]

Looks like a heat caused gas bubble.

 

[xr7ator]

Looks like? It IS corrosion.

 

[Diver_Down]

Twitch is correct. It likely was in a fire. The bubble by the date is caused when the copper layer heats up and melts at a lower temperature than the nickel clad outer layering.

 

[Coinstar magnet]

Wouldn't that be bizarre if the damaged bit was at the back of the head...