1952 LWC DD Unknown RPM?

I did a new thing and purchased some wheat rolls with a wide variety of coins, for every decade except 1909. Here is a 1952 D LWC, I see a RPM, but no mention of it in Wexler files, any guidance would be appreciated on whether you seen an RPM or is this a form of MD? I also think some of these coins were cleaned, they look orange/yellow, and under the microscope you can see some solidified white flakes.