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I'm thinking either it is a die gouge or the mintmark was damaged at some point. I don't search through enough Jeffersons to know about the MMs on '53Ss. I may be worng so I'll let some Jefferson people chime in on the specifics of this coin...
Now, there doesn't appear to be a listing anywhere for a '53S OMM, suggesting you have one is difficult unless the coin is in great condition and one does a study with overlays to try and prove the underlying shape is another MM. This may be the product of over looking at finds. I would suggest trying to look at far more Jeffersons, like thousands, give yourself no more than 15 seconds per coin, front and back, and move on. Anything with a question should be put to the side and re-examined later with a skeptical eye. Assume it isn't something new and take it slow - rule out obvious issues such as MD, DDD, PMD, gouges and so on before thinking it is something as specific as a OMM.
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