Hello, im looking to determine the production year of my SKS. From what I could find it is either a 1957 or 58, as it does not have the year or star with arrow stamped on the receiver cover. The serial number does have the Russian "I" looks like a z in front if it. There is a star on the butt, as well as after the serial number on the receiver. The last picture are markings on top of the butt. Would someone be able to confirm the year of production and any other pertinent info?


















































