If you can't tell the difference what does it matter.
you have to be newb to say that .
its a sino , the first year it was produced in china with russian help and russian parts in that rifle, its a collector item.
how much a collector pay will depend on alot of factors , especially whether the rifle was refurb or not , a non-refurb/fired will ofcos fetch more than a refurb/fired and a non-refurb/unfired even more than that.
its difficult to see from pics but one must ask are all numbers matching? if so when you run you fingers on the serial numbers , can you feel the edges of the numbers , un-buffed has sharp edges and buffed are smooth , secondly does all the number look alike , i mean look at the "7" and "4" , are they the same style.
my sino is clearly refurb cos i can see filing marks around serial # on the trigger guard , also the serial # on the mag was stamp without a mandrel so different depth, its was probably refurb in the 80s or 90s , the numbers are smoother , also the "7" and "4" , looks differents on different parts .
BTW, is that rust where on the gas tube meets the gas block?