Rim error on Polk dollar?

I found this in a roll of Polk dollars. The first two arrows show what looks like a letter B. This is not post mint error. The third arrow is post mint error.

 

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rim -rim contact not an error?
:loud: but a larger photo would help

 

Here is a larger photo of the "B"

 

Jello has it exactly right. It is not an error. It is post mint damage.

The edge lettering is incuse on a normal coin and when coins bang together edge to edge, the incuse lettering can act like a die and mark the edge of another coin.

Very common in the overall scheme of things.

Thanks,
Bill