2007 D penny -So I'm not sure what is really going on with this penny, looks like multiple extra strikes to the obverse
Hiya @Walter Marx - The split plating seems to be occurring on the obverse around the date and also on the reverse of your coin around the top of the upper legend (UNITED STATES). I think I can also see it around the sides of the memorial building. There are many articles about split plating or "split line doubling" (I like that terminology and will begin to use it). Here is a good one with nice photographs. https://www.errorvariety.com/OFD/PSD.html