It is one of the last of the original SKS 45. After the first year some changes were gradually made. The spike bayo was changed to the shiny blade bayo. The gas block went from 90 degree to 45 degree. The receiver cover release handle tab is hollow that changed to a filled in one. The firing pin in yours is the original spring loaded firing pin with the small retaining pin. The bolt carrier and bolt received some changes after this too. The rear sight block also had a change but that didn't happen for a couple more years. I would assume yours is the early one as all the other 49/early 50 parts are there. Pics would be needed to confirm. The bayo has already been changed. Would need to see the front stock ferrule to see if it is the original or was changed to accept the blade bayo. The fact that it wears a later stock I would think it might have. More details can be found in this thread:
http://www.canadiangunnutz.com/foru...SKS45-ID-FAQ-Collectibles-update-feb-8th-2011
You can see the differences and the progression of changes.
These early guns are rare and there is a good chance no more will be brought into the country. Please do not bubba this one if you were considering doing it. Cheers
ljones