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You have to get more numbers. Cannondale seems to have used 11 character codes 1986-1992, however. Tell them to take a high resolution photo of the underside of the bottom bracket. See this web page: http://vintagecannondale.com/info/serial_numbers/
Here is are the catalogs for most years of production 1973-2007:
203 members
1 member
270 members
1 member
261 members