Mint marks were placed by hand back in the day--through 1989 is my understanding. Consequently, the position of mint marks will (and do) vary. I've come cross '56 Ds just like this one.
@itz, a better closeup image of the mintmark is needed to see if there is a RPM. With that said, I'm not seeing a great match with the known RPMs. Here is the varietyvista link to help you with your research.
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