Looking through BenFranklin half dollars I found 1954 S, hole stamped in chin with T in it?

I was looking through old coins I haven't' looked at since me and my brother and dad collected them as kids. I have a 1954 S that has a hole stamped in the chin with what looks like a T or Y stamped in the middle of it. It also has the bugs bunny teeth. I found info on the bugs bunny teeth but nothing about the chin error. Does anyone have any info on this. Thanks

 

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In focus photos of the coin would help. So far it sounds like damage.

 

If the stamp is incused it is known as a Counter Stamp
It was added to your coin after it left the US Mint. Not a Mint Error.