Not for sure on the exact Rpm. But looks close lol maybe MD? I see alot of MD.New Camera attachment for my phone works great!
I just don't think its correct,the mm looks exactly like the DDD. Also the PCGS example has a little notch spot for the top and yours goes across the whole top.
I don't see the markers, and the 502 is an open S over a closed S which yours is not. Also the attributed S/S is lower than yours and tilted slightly left, while yours is tilted slightly right and is a little higher. I think DDD
How many would you like? I have a roll of unc. 1954 s Jefferson nickels that look just like that op specimen. Not an over mint mark, not an rpm , a die chip in the mm, and plenty of die deteration.