unkown cannondale

Hello, I have a Cannondale with serial number 16110486092. Based on information found on his site the head badge indicates it was built between 1983-1989. I acquired this bike in approximately 1992 and the bike was in new condition. When I purchased the bike i was told it may be a concept...

Hey folks, just bought a nice old Cannondale frame but Im totally unable to identify it. The only thing written on it says CAAD1 still from the made in USA series. I attached you some pics. Id really appreciate your help!