Hey everybody, got a quick question. A friend of mine's dad passed away and left behind a bunch of guns, in amongst them are 3 SKSs. I know there's a difference in value between the Russian made and Chinese or Yukoslavian made ones. But I can't find marking of any kind on the outside of the guns. One does have a star on the stock but that's about it. How can I tell where these are from? Needless to say I know nothing about these. Any info is GREATLY appreciated! Thanks!