Back in 1993 I popped into Johns Bikes in Bath and came out with a M800 Beast of the East.Sitting alongside it was one of your bikes which I still remember because it seemed so apt at the time,patriotic colours on an American bike.
It so grabbed me that when I recently renovated a Beast I briefly considered having it done in those colours.The problem is that it doesn't appear in any of the catalogues,but there are a few pictures on the web.
If you can get a frame number vintage cannondale will have the details to give a definitive answer.