Looks like an internal die chip. Most often we see die chips on the outside edges of the devices. Looks like die flow is happening in the fields, the coin die is probably in the LDS die state when your coin was struck.
Here are a few links to find hub doubling better: http://goccf.com/t/265641 These links will show you what to look for when searching for hub doubling. What also is Machine damage and various other subjects.
Trying to find these another time. remember coophome= when you search for them again. I tagged each link with this term. The first one takes you to the thread where all of them in the same area.
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