While there have been periods where dramatic changes have occurred, for example: the transition periods between Leo's Fender and the CBS years, as well as the transition between CBS' Fender and the current ownership, generally speaking, most models are feature specific and do not change from year to year..
The vintage series used a "V" prefix in serial numbers.
Given the modular nature of Fender's production techniques, a neck may have been produced in one year, placed in a warehouse and remained in stock for a period of time, and then subsequently paired with a body to create a complete guitar in the following year.
So, obviously a neck date, while being helpful in providing a date range of production, cannot be a definitive reference.
Maybe the transitional guitars from MIJ to the CIJ??
) JV 5 digits 1982-1984SQ 5 digits 1983-1984E 6 digits 1984-1987A 6 digits 1985-1986B 6 digits 1985-1986C 6 digits 1985-1986F 6 digits 1986-1987 G 6 digits 1987-1988H 6 digits 1988-1989 I 6 digits 1989-1990J 6 digits 1989-1990 K 6 digits 1990-1991 L 6 digits 1991-1992M 6 digits 1992-1993N 6 digits 1993-1994O 6 digits 1993-1994P 6 digits 1993-1994Q 6 digits 1993-1994S 6 digits 1994-1995 T 6 digits 1994-1995U 6 digits 1995-1996N 5 digits 1995-1996V 6 digits 1996-1997In 1997, Fender transitioned to a serial number decal that included the words “Crafted in Japan” above the serial number.