I also found a ODD mark to the right of the makers mark, under a 5x loupe it appears as a Darkened 0, this was just pulled out of a UN Mint set by me so no tampering.
I can not confirm your half dollar for sure as the FS-102, DDO-006 from your photos. Since you have the half dollar in hand, try to compare the doubling with the attached photos of the 71D DDO-006 from my collection, note the four serifs on the lower I of IN, and the doubling on the hair under the B of LIBERTY.
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