I've not heard of Special grade, I know there is a select which really doesn't pertain to condition but more rarity.
Mine I believe was a Select, it was one of the early ones that they modified to launch rifle grenades. The back of the receiver is black where it was dipped in molten lead to apparently temper it as they had a tendency to crack.
It's also in pretty good condition, I felt very lucky and blessed to get it. I got it from a guy that got it from CMP, didn't go direct.
Bought it sight unseen and couldn't be happier.
Hope they come through for you and you get something very "Special".
In Memory of Paul "Dietrich" Stines.
Dad: Say something nice to your cousin Shirley
Dietrich: For a fat girl you sure don't sweat much.
Cue sound of Head slap.
RIP Muggsy & TMan
"If you are a warrior legally authorized to carry a weapon and you step outside without that weapon, then you become a sheep, pretending that JOCKO will not come today."