D over a D, is this unique?

I found a bunch of these in some rolls of SD quarters. What kind of doubling is this? They all look the same.

It appears there is another d shifted down and to the right that is very faint but very visible.


Thanks, Matt

 

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It looks like to me that someone put a patch on the coin..I don't think you will get rich with this overdate.

 

strike doubling, not a double die.
Very common, no value.