OK, #1, I'm guessing it is chinese due to the lack of a rib on the back, and the fact the follower looks just like the chinese stamped mags I've gotten. What variant is it, and is it worth a shit both monetarily and function wise? #2, is this a yugo bolt hold open mag? It doesnt have the back cut out of the follower, but I just got 7 of them in the last 24 I ordered, along with a few more in the previous 24 I got. Also, are they good functioning mags and are they worth anything more than like $10 a piece? I found these pictures on arfcom, so just in case someone else needs help on identifying mags, they can use this as sort of a guideline. It only covers those 5 kinds, and it seems like there are 11ty billion variations.