I found this 1990 double D penny.

I found a coin on the ground today, and when I looked at it I could not tell that anything was wrong with it. When I got home, I looked at it through my magnifying glass, and It has a Doubled D on the mintmark. Is this a common error?

 

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It also looks like the numbers are doubled.

 

Not a form of doubling but a die detoriation. very common in the 90s cents...sorry no value at all.

 

OK. Thanks!