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In general, an initial letter indicates the decade, with S = 70s, E = 80s, N = 90s, Z = 2000s. Also California Series serials (1997-1998) use an "AMXN" prefix followed by 6 digits, and were jointly made by Fender USA/Mexico.
A number, usually 5 to 7 digits long, follows the letter and helps to further identify the year. Made in Korea Serials (may or may not have letter prefix.
SZ(XXXXXX) Signature Series SZ0(XXXXX)='00, SZ1(XXXXX)='01, SZ2(XXXXX)='02, etc.If you're not averse to removing the neck on a guitar, Fender often wrote a date on the heel of the neck, as well as a date in the neck pocket.