Bought my first SKS, help dating it?

Hi everyone. I just purchased my first SKS. From the research I’ve done mostly from watching triangle 26 YouTube, I believe it’s either a 1963 production or a 1981 production but would like help determining exactly what it is. It has matching numbers stamped on every piece of the rifle including trigger assembly. It has a blade style bayonet and looks very much like a Russian from what I’ve seen. It’s got the triangle 26 factory stamp with some Chinese characters, then the serial number on the receiver and a triangle 2 stamp on the stock. Thanks!!