I came across this by accident. Lighting needs to be pretty specific to see it. So it's a very minor anomaly on the upper edge of the ribbon on the reverse. Can be seen well on the full reverse image. I'm thinking a form of DDD.
Seeker, here are some others similar to what you have, different year and mint but there are several of these out there now getting listed. 2023 does not have any on all three of the major sites. Scroll down to the reverse doubled dies.
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