Fender tag decode help please? 1963 Val

G'day, I have a 1963 Valiant Signet (USA built - LA plant).
Arrived in Australia last year.

Can anyone on here please help with a decode on the alphabetical part of the fender tag please?

Mine is stamped:

A = 3
G = 1
J = 5
K = 7
L = 6
N = 8
P = 1
Q = 2

I get the lower portion (SO # etc), but I can't seem to find any info on the alphabetical codes anywhere. :banghead:

Any help really appreciated - thanks
Gary