My SKS just arrived:)

[Alake]

OK i should have read th SKS facts first But there is still the 2 stamps i am unsure about the one on the stock looks like a square with the bottom missing. and the one below the star and tothe right of the diamond shaped one. Is this the double stamp that is rare or something else?? Only thing it didnt come with is the manual. Barrel looks to be original. Rifle is stamped 1950 but the gas block is angled does this mean it was replaced, i thought i read it was supposed to be squared? Everything else is as posted in the SKS facts for the year. Thanks again for any info you may have
Tony

It was mentioned that a 1949 SKS has unique features not on other models any one know what these features are?