Sks further info

So I looked at the SKS at the shop today, and I found out some further info, just by looking at the reciever. So the first two digits of the serial number were 11, and 11+56=67 meaning the rifle was manufactured in 1967. There was also a triangle with the number 26 in it. This is the factory code, and this particular code is for the oldest state owned armory (pre-WWI). So to recap, Norinco SKS 1967 with spike bayonet for $225. I really want the gun, so if mom or dad are reading this, do some serious thinking! The amazon link is for an aftermarket stock (swap out internals).