What causes this?

This is on the Maine 2003 quarter. These areas seem to be filled in. How would this be caused?

 

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Looks like it was caused by die chips to me.

 

They are indeed die chips. Small pieces of the die will chip and fall away. When a portion of the die falls away, it leaves a depression in the die that translates into a raised portion on the struck coin. This is common between some of the smaller parts of letters and numerals.

Thanks,
Bill

 

Thank you...