1972-D Kennedy Half Dollar - Is This A No FG?

Me I do not see any traces of FG. I think the coin could be an 40

if FG is there, it's not obvious, I'd say that qualifies

the reverse has odd coloring, like the coin has been cleaned

They are just a die polishing event to remove damage from the die. Being a sub devices (slightly lower than the fields) die polishing can affect these devices. When they are totally missing grading companies goes crazy about these to be graded. As a common die event, I see no premium for these, but other do. To me they are just a die event. (Newbies go crazy over these) probably the ones buying these in slabs. Someday it will come to the collectors that these are not a special die variety, but a die event that commonly happens when the dies are polished. When this happens, then all the slabs will stop selling and the bottom will fall out of the market for these. Happens often on most series of designs. Time will tell if I right or not.