MONTH of production: (2nd letter of serial number) ----- A = Jan B = Feb C = Mar D = Apr E = May F = June G = July H = Aug I = Sept J = Oct K = Nov L = Dec YEAR of production: (1st letter of serial number) ---- A = 1954 or 1980 B = 1955 or 1981 C = 1956 or 1982 D = 1957 or 1983 E = 1958 or 1984 F = 1959 or 1985 G = 1960 or 1986 H = 1961 or 1987 I = 1962 or 1988 J = 1963 or 1989 K = 1964 or 1990 L = 1965 or 1991 M = 1966 or 1992 N = 1967 or 1993 O = 1968 or 1994 P = 1969 or 1995 Q = 1970 or 1996 R = 1971 or 1997 S = 1972 or 1998 T = 1973 or 1999 U = 1974 or 2000 V = 1975 or 2001 W = 1976 or 2002 X = 1977 or 2003 Y = 1978 or 2004 Z = 1979 or 2005
Sometime after 2000 ? they may have changed the serial-# setup and now put the manufactured date on the unit.
I wonder if the government had anything to do with that, since I have seen dates on other brands ?