1956 D penny question?

[Coldestfrost]

Hello!
I was coin roll hunting and found a few 1956 D pennies. One of the pennies has the mint mark almost touching the "9" and the "5", while the others have their mint mark much lower on the coin. This is the best picture I could get...

Gyazo - cde0bd4ac5839df933eae9ae06fec33b.png

 

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[enamel7]

Mint marks were added to the working dies by hand back then. It can be about anywhere as long as below the date. Perfectly normal.