Originally Posted by
T-Mar
My immediate impression was also a Colombo. Other Concorde models offered with 600 Ultegra were the Prelude and Prestige. Seat post diameter?
Will try to find a caliper to get a precise measure. Meanwhile, I've searched for a SN and only found on the BB shell the number 48 (size presumably) and the code "3E" or "3F".
Might also add that I'm in Canada. I don't know if Concorde had a special line up for North America but you probably know this!