You may also want to look at this then, when it comes to Russian types to collect according to "Weimajack" who has seen his fair share of the Russian SKS...
Then of course you have the Chinese, with the Sino Soviet, the pre-66 version with the blade bayo, the post-66 version with the spike bayo, maybe a version with fibreglass jungle stock, and the commercial SKS-D (spike, bayo, no bayo) and the rest of the commercial versions.
And the Yugo M-59 "B" and "C" series, good luck finding an "A" series. And the M59/66 (iron sights), M59/66a1 (Phosphorous Sights) and the M59/66b1 (Tritium sights).
And also, most likely out of the USA, the Romanian and Albanian versions.
And the really hard to find Vietnamese and German versions.
And might as well throw a 55/56 Russian refurb into a Polish Wz.49 parade stock if you find one of those, just to round out the types. There are others when you get that far haha.