Hi

Ive got a Rolex clap with a VC code.
I do not find anything about the corresponding year of production.
I am quite sure to get this clap fron a GMT Master bought in the early 80s.
Could you help me ?

Best regards.

A (VA) 1976
B (VB) 1977
C (VC) 1978
D (VD) 1979
E (VE) 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
V-1996
U-1997
Z-1997
X 1998-1999

AB-2000
DE-2001
DT-2002
AD-2003
CL-2004
MA-2005
OP-2006
EO-2007
PJ-2008