1955 Wheat Penny DDO? Or Strike Doubling.

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Would this be a double die, strike doubling or mechanical doubling?

 

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It's a bit hard to tell since the pictures of the coin are at an angle and not directly overhead but it looks to me like the Poor Man's Doubled Die which is actually caused by die deterioration.

 

not a DDO, SD

PS: Strike doubling, and mechanical doubling are the same thing, just different names