About This File
These pages are from the front of the Kohler service manuals
1965 - Serial begins with a letter - A
1966 - Serial begins with a letter - B
1967 - Serial begins with a letter - C
1968 - Serial begins with a letter - D
1969 - Serial begins with a letter - E
1969 - 7-digit serial number - First two digits 10-19
1970 - 7-digit serial number - First two digits 20-29
1971 - 7-digit serial number - First two digits 30-39
1972 - 7-digit serial number - First two digits 40-49
1973 - 7-digit serial number - First two digits 50-59
1974 - 7-digit serial number - First two digits 60-69
1975 - 7-digit serial number - First two digits 70-72
1976 - 7-digit serial number - First two digits 73-79
1977 - 7-digit serial number - First two digits 80-89
1978 - 7-digit serial number - First two digits 90-94
1979 - 7-digit serial number - First two digits 95-99
1980 - 8-digit serial number - First three digits 100-109
1981 - 8-digit serial number - First three digits 110-119
1982 - 8-digit serial number - First three digits 120-129
1983 - 8-digit serial number - First three digits 130-139
1984 - 8-digit serial number - First three digits 140-149
1985 - 8-digit serial number - First three digits 150-159
1985 - 10-digit serial number - First two digits 15
1986 - 10-digit serial number - First two digits 16
1987 - 10-digit serial number - First two digits 17
1988 - 10-digit serial number - First two digits 18
1989 - 10-digit serial number - First two digits 19
1990 - 10-digit serial number - First two digits 20
1991 - 10-digit serial number - First two digits 21
1992 - 10-digit serial number - First two digits 22
1993 - 10-digit serial number - First two digits 23
1994 - 10-digit serial number - First two digits 24
1995 - 10-digit serial number - First two digits 25
1996 - 10-digit serial number - First two digits 26
1997 - 10-digit serial number - First two digits 27
1998 - 10-digit serial number - First two digits 28
1999 - 10-digit serial number - First two digits 29
2000 - 10-digit serial number - First two digits 30
2001 - 10-digit serial number - First two digits 31
2002 - 10-digit serial number - First two digits 32
2003 - 10-digit serial number - First two digits 33
2004 - 10-digit serial number - First two digits 34
2005 - 10-digit serial number - First two digits 35
2006 - 10-digit serial number - First two digits 36
2007 - 10-digit serial number - First two digits 37
2008 - 10-digit serial number - First two digits 38
2009 - 10-digit serial number - First two digits 39
2010 - 10-digit serial number - First two digits 40
2011 - 10-digit serial number - First two digits 41
K91T-31388A Serial 425251 found on RJ-59