I'm not 100% positive, but I think the "no FG" variety exists in the 1972D, 1973D, and the 1982P. I believe the '82P is the most common. Someone on here will know for sure.
I have always been under the impression it is the 1982 and 1983's that have No FG varieties. It also looks like 1990 has been added to the list. I've also seen them quoted at around $3-5. http://www.collectorscorner.org/pocket.html#Halves
For sure the 1972-D is listed as "no FG". I've gotten a 1984-D and 1983-D with no "FG". Use a strong class to make sure there is absolutely "No FG". Many are very faint, but still count as having the "FG".
rileyboy