It's been a while since I dug my S'G' from the back of the safe but I'll do so when I get home from work tonight. Although I don't have anything about a '7' on the front sight it's possible there is one and I neglected to note it on the informal data sheet I made out when I first bought the carbine. I have the safety listed as a type II (plain face) and the 'IN' marking is on the inside.
Mikey51 - thanks for the photo of the front sight, is it on an S'G'?