1964 Kennedy Half SMS
I have this1964 Kennedy Half. I checked the usual marks and they are present. The finish is also present as well as the area between the tops of letters and inside of rim which on the SMS test coin was polished with identifying marks all around in this area that is not found on any other or even similar. The gap above the letters to the inside of the rim is consistent on all the graded examples with same identifying polishing marks on them.
There are very fine die cracks on graded coins seen in enlarged images like one on right side of eagles neck going through the star and on left a few that match under United like the one going through the Dot - rim to wing. I enlarged graded images and matched all the way around this coin to enlarged images of graded.
The finish is present like very very fine finish that appears that the planchets were perhaps sand blasted and dies polished providing a satiny look.
In any case it appears that I truly have found a 1964 SMS coin. I am posting images of my coin. Have a Blessed Day!