Just my personal opinion but, it appears to be a slight Die Chip at the 9. Actually quite common in 57 LMC. They are fun to collect though. Here is one of many that I have found. In fact yours looks very similar to the one I posted, but you can tell the different by the mint mark. they are slightly askew of each other. Just shows how common they are. I added another photo to show how various they can be.
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