White tape works well! You could look at the catalogues I posted above, although your bike might be older than what they cover (my first post in this thread also has the 2001 catalogue). Clues to look for: Is the fork tapered? Is the headtube tapered? (If no on these, then probably 2001 or earlier, if yes on fork, no on headtube, then likely 2001-2002, if yes on both, probably 2002 or later). As for model type, what kind of groupset did it come with? The top models, REX pro, rs6 pro, typically have either dura ace or record. Lower models, simpler groupsets.
Hope that helps.