Markings will be the default answer, though some models have unique features which make visual identification possible, e.g., the Yugoslav M59/66 has the gas cutoff and is set up with a grenade launcher sight and rifle grenade launcher, Chinese rifles usually have a spike bayonet for the basic Type 56 carbine, Albanian rifles have a very distinct look. If you send me an email with a photo and detailed description of the markings (my email address is posted in my profile), I'd be more than glad to identify it for you.
Take it to a gunsmith and ask for help
Between $250 and $350 for a decent one.
What you have described doesn't exist, so, it can't have a value.
Condition?
Value of ANY gun is based on exact make, model, and condition. A well worn Yugo SKS may be $150, while a pristine Russian SKS is $500. An average Chinese SKS is around $250-$275.
SKS made by Norinco (chinese)
Could be a Type 38
Right now, NORINCO (Peoples Republic of China) is the only current manufacturer of the SKS rifle. In the past, they've been manufactured in the former Soviet Union (Ivhesk and Tula arsenals), former Yugoslavia (Zastava), Romania, East Germany, Albania, North Korea, and North Vietnam.
Check the receiver.
Not without a detailed description of all markings and features.
No sn data to date it against
i am curious as to how much a 1955 Remington 03.83 Modle M1 army issued riffle in mint condition might cost.