Pennies

Hello everyone, hope you all are doing well. Can anyone tell me why these pennies look so rough, or bubbly ?. This is a first for me. I dont get how they got like this. Is this machine doing?. Thank you in advance for any info.

 

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Plating Bubbles.
Common issue on Copper Plated zinc Cents.

Some occur during the minting process and some occur because of Environmental Damage.

 

Thank you sir. How do you distinguish the 2 brother. For future knowledge.

 

Here is a plating bubble definition -
https://coinauctionshelp.com/bubble-plating-mint-error/

 

All zinc with copper coating so they are plating blisters. Very common.

 

Understood. Thank you!

 

You're welcome