1951s, s/s rpm

Feedback please-I am excited that I found this coin, it appears to have an error verified to exsist by previous finds on record. Am I seeing things?

 

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It looks like a possible S/S RPM.
Do you have any references?
Here is Variety vista
Hope it helps.
http://varietyvista.com/02a LC RPMs Vol 1/RPMs 1951S.htm