That's going to be late 1967 or early/mid 1968. Closest dated serial number I have is 1050XX which dates to 1967. Oct. 22, 1968 is when the Gun Control Act went into effect requiring all firearms imported or manufactured be issued a serial number, and that's when Savage started using the letter prefix on their serial numbers to clearly differentiate those firearms made before and after the GCA went into effect.