I recently purchased a Merckx Corsa Extra in Telecom team colours.
It's a 60cm frame, but has a very short top tube at 54.5cm, so I suspect it is either a custom build or one of the criterium builds of the early 90s. It has a number mount braised underneath the top tube.
Any info on the above would be appreciated, especially:
1. About what year would this bike be? 2. Could it be an ex team bike? 3. What components was Telekom using at the time?