Sweet 649, Your serial AFN prefix might even be late 1984 according to the SCSW , If so it may be one of the first ones made as the 649 was supposedly introduced in 1985,
This is 1 of 100 comemorating their introduction but is prefix AHT dating to July 85, the serial does end in the number 1 but ,
Im not sure if the 649 series was made with consecutive serial numbers or just as they reached that work station .
Edited to add, Note the differences in the spacing of "Made In USA" on our two guns ,
Looks like there are some other slight differences in the address rollstamp as well.