Need help with 1969 d Lincoln cent error

I have a 1969 d cent and I was looking at it and noticed that the "d" mintmark was remarkably small and I could not find anything online about this and was hoping someone could help me.

P.S. it is also a floating roof too if anyone was wondering.

 

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A small, dark and fuzzy picture is of no help.

 

Red book says they made his head smaller maybe they did the mintmark too.