What you are seeing is something that effected the metal flow during the strike, Look above the S, on the left side. If you follow that part that I am sure you are looking at inside the loop of the S , you can see it extending out the top of the S. The shape of what you see is tantalizing but it does not conform to the shape of a D mintmark.
Additionally, if you look at the surface of the coin between the 6 and the 9 in the picture, you will see more lines that radiate down. That is what you are seeing inside the loop of the S.
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