Depends on where it was manufactured, overall condition, and rarity. The former Soviet Union, former Yugoslavia, former East Germany, Romania, Albania, North Korea, and former North Vietnam all manufactured variants of the SKS which were issued to their military forces. You could be looking at anything from $200 to over $1500, dependent on these things.
20-45 USD
All SKS carbines were made in 7.62x39. As for value, anywhere from $100 to over $1500, depending on where it was made, overall condition, rarity, etc. The SKS was manufactured in the former Soviet Union, China, former Yugoslavia, Albania, Romania, former East German, Vietnam, and North Korea. Adding further to the equation, there are both military issue Chinese SKS carbines, and ones manufactured for the civil market. We'd need a lot more information in order to narrow down the value.
What you have described doesn't exist, so, it can't have a value.
Samozariadnyia Karabina Simonova (Russian military carbine)
About $300, depending on condition.
Depending on condition, $175-$275.
You might be able to find an SKS in the $150 - $200 price range.
$125.00 to $225.00 condition and matching numbers on the parts has an effect on price .
You DO know these were made by several nations? And that serial numbers are not unique to only one gun in the world? Average price for an SKS is good shape is $250-$300
$250 - $500, depending on condition, with the $500 range being for one in unissued condition.
SKS Microfinance was created in 1998.
The D and M models accept AK47 magazines whereas the standard sks has an integral magazine.