There is a slight possibility of an RPM but need cleared and closeup of date/MM like this pix of what appears close:
I say close because the east protrusion in your looks higher than in 1957D-1MM-011
your's seems more centered and doesn't even show in pic #1. Markers in this die state(MDS) are very heavy verticle die gouges running through the date, especially the 5.
I'm a newbie..and therefore I tend to "see" things where there are none (or not see what exists), but.... I see a D over a D (repunch mint mark = RPM) and a die chip under it.
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