A3331 Y9X
Corsa Extra 1987 (May/June)
Y - EMC employee
9 - 59 cm seat tube (c-c)
X - Columbus SLX/SPX tubes
Paint pattern: team Kelme (or TeVe Blad) 1986-1987
Brake bridge pattern: Silva 2, used exclusively in EMC 1986-1987
The inscription on the top of the bridge is MOD.DEP - probably an abbreviation for the French (!) "modele depose" (sorry, no accents) meaning more or less "reserved design".