Here the component spec from the trek museum:

Trek 1200 (2002 model)
FRAME Alpha™ SL Aluminum.
FORK Aluminum aero.
WHEELS Aurora rims.
COMPONENTS Shimano Tiagra crank and 9-speed shifting. Triple chainring for wider gear options on longer rides.


The latest model is 105 [edit (can't read!)] rear dereilleur. Everything else is still Tiagra.

Full specs on the 2002 model available at http://www.trekbikes.com/bikes/2002/road/1200.html