First thing is that the doubling MUST look EXACTLY like the doubling on the RPM you are trying to match it to. Yours doesn't.
Second thing is that the mintmark position must be EXACTLY the same as the one you are trying to match yours to. Yours is farther away from the 5 than 1951S-1MM-003.
Those two things alone tell me that you definitely don't have the right RPM.
Then the flattened, shelf-like doubling at the top of your mintmark looks much more like Machine Doubling than something that was in the design on the die. All this together equals Machine Doubling and really nothing else.
Second thing is that the mintmark position must be EXACTLY the same as the one you are trying to match yours to. Yours is farther away from the 5 than 1951S-1MM-003.
Those two things alone tell me that you definitely don't have the right RPM.
Then the flattened, shelf-like doubling at the top of your mintmark looks much more like Machine Doubling than something that was in the design on the die. All this together equals Machine Doubling and really nothing else.



















