Shimano uses a two digit code to track the date of manufacture. The first letter is the month and the second digit will be the year (EI would be May of 1984). Generally, the code is fairly easy to spot but is usually on the "back side" of the part.
Shimano Timeline
Shimano Year Code
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A-1976
B-1977
C-1978
D-1979
E-1980
F-1981
G-1982
H-1983
I-1984
J-1985
K-1986
L-1987
M-1988
N-1989
O-1990
P-1991
Q-1992
R-1993
S-1994
T-1995
U-1996
V-1997
W-1998
X-1999
Y-2000
Z-2001
A-2002
B-2003
C-2004
D-2005
E-2006
F-2007
G-2008
Shimano Month Code
A B C D E F G H I J K L
January February March April May June July August September October November December
Shimano Timeline
Shimano Year Code
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
A-1976
B-1977
C-1978
D-1979
E-1980
F-1981
G-1982
H-1983
I-1984
J-1985
K-1986
L-1987
M-1988
N-1989
O-1990
P-1991
Q-1992
R-1993
S-1994
T-1995
U-1996
V-1997
W-1998
X-1999
Y-2000
Z-2001
A-2002
B-2003
C-2004
D-2005
E-2006
F-2007
G-2008
Shimano Month Code
A B C D E F G H I J K L
January February March April May June July August September October November December
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