Sorry 2007 P not D. The top of the "T" on Liberty has something going on ? Wasn't going to ask but then again hoping for more than just worn die or chip!! There is a die chip on the "2".
ff-topic:Still same series just 2006-P Jefferson Error??? not sure but you can also find it on a 2007-P too
Yes, die chips are very common along the edge of any device or letter where the field drops off into the recesses. It's like a river bank that succumbs to a heavy flow of water from ground level into the river. Chris