I would also say that it's likely a 2004 5200 or 5500. It has 9spd DA shifters, but an ultegra crankset...hmmmm. Also,if you look closely...it has the tiny "Hand Made in The USA" with the little US flag on the chainstay. The lack of a Trek logo on the top tube make me wonder if it was a project one bike? Looks like maybe a 52cm?
__________________
Just Do It..