Managed to pick up a Cannondale R300 for $100.00. I don't know for sure how old it is, but it's a 10 speed (2X5) down tube shifter model. Had what looked to be the original Continentals on it, original (I guess) white cable housings and has Shimano Exage 500EX derailers.

Replaced tires, the "old folks" large padded seat, and off I went. Any ideas as to how I can figure out how old the bike is, and is this as nice a bike as it seems?