Different Mint Mark Shadow?

Well I'm trying but it's an iPhone and it's not very crisp at that magnification

It's just damage. I see what you mean, though.

On the area above the mint mark, something hit the coin, pushing the metal in that area. When this happens it snow plows the field to thin in one area and raise where it stops leaving a raised edge there. Just a damaged area in that location. The mint mark tells me the post that forms the center of the "D" has broken off the die. Now it leaves that area not formed as it die on other coins when the die was new. Sorry no premium for these events.