Welcome from Washington State!
Glad you survived your close encounter with an RPG
If you like the Chinese Type 56, this is a good place to start for new information since 2014 regarding dating:
https://sks-files.com/index.php?topic=360.0Browse around and look at the sticky topics or run a search on a subject since the search function actually works
Since 2014 on the Yugoslavian front, a healthy handful of long barrel M59s and the Slovenian Protokol (Honor Guard) rifles came into the country.
For the original SKS-45, I know RM (running man) has collected a ton of data...but correlating, cogitating and concluding is still in the works. The Russian SKS remains the most often mis-dated due to the year being on the receiver cover (1949-55) and most of them being refurbs with frequently mixed receiver covers.
Albanian and Romanian SKSs are the most obvious (generally) with the year next to the serial number on the receiver on the majority of them.