Need help.. possible errors?

[Nelson808]

I found these pennies that are different in size. The little one is regular size

Could they be errors?

 

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[enamel7]

Those appear to be what are known as "Texas cents". They were hammered, possibly between two pieces of leather, to remove the copper plating. These aren't errors from the mint.

 

[cudamark]

They do weird things in a fire too.