Oh yes, I almost forgot - I swear that a few years ago, I saw what claimed to be an official BATF doc - which showed the serial numbers, by Chinese manufacturer for pre-ban SKS rifles. There were not that many manufacturers shown. I remember Norinco and I believe two others. Both of the others were well known to me at the time, but I can't remember them now to save my life. Anyway, I'm not imagining this - there was such a list, though, of course, it could have been a forgery I suppose. I believe it was on the Internet, though I could be mistaken on that.
So long, and thanks for the fish!