Serial Number on Peghead Decal.
U.S. made Fenders, starting in mid-1976 has the serial number on the peghead. Note the following number could be off as much as two years. Generally speaking, a "S" prefix equals the 1970's, "E" prefix equals the 1980's, and "N" prefix equals the 1990's. Note "E" and "N" prefix models are sometimes also Japanese-made (see below).
7600000 ("76" in bold) = 1976-1977
800000s = 1979-1981
1000000 to 8000000 = 1976-1981 (7 digits)
S1 to S5 + 5 Digits = 1979-1982
S6 + 5 digits = 1976
S7 + 5 digits = 1977-1978
S8 + 5 digits = 1977-1978
S9 + 5 digits = 1978-1981
E0 + 5 digits = 1979-1981
E1 + 5 digits = 1980-1981
E1 + 5 digits = 1982
E2 + 5 digits = 1982-1983
E3 + 5 digits = 1982-1984
E4 + 5 digits = 1984-1985, 1987-1988
E8 + 5 digits = 1988-1989
E9 + 5 digits = 1988-1990