Unusual or common?

Is this common? Is it an error or variety? The coin is not in great shape, but it is what it is I guess.

 

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If you are asking about the LIB then its a minor error. I'm sure you have already heard of a Greased Filled Die Error.
Or as I like to refer to as Debris Filled Die.
It is very common!
Here is what occurs -

 

No I was referring to the bar under the word liberty.

 

You should of stated that in your first post.
Could be a simple Die Chip. Yes unusual but common at the same time.

 

I found it on Cuds-on-coins.com website. It is a LDB6-1953-001B and 001C. I new I had seen it somewhere but couldn't remember where. Thanks