Nice find! There are many different Retained Cuds listed on cuds-on-coins for 1940-S cents. I can't say for certain from your photos, but it looks like one of these listings:
RCD-1c-1940S-02R (possibly Stage B)
RCD-1c-1940S-69R
If it isn't one of those, here are the others that are fairly close:
Possibly an earlier stage of RCD-1c-1940S-31R, but your mm looks a bit more to the east
RCD-1c-1940S-52R
RCD-1c-1940S-67R
RCD-1c-1940S-77R, but again your mm looks a bit too far east for this one
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