Better late than never: Eddy Merckx (commonly known, but unofficially "Professional") last version (no chain bridge), Columbus SL, production beginning of 1985. 3 = 53 cm seat tube (cc), A - code for employee EMcycles, Z - series produced from late summer 1984 to autumn 1986, 1667 - beginning of 1985. Stickers with maps of France and Italy and stripes of the World Champion and the inscription MEXICO and numbers were placed from the beginning of production to ~ Z3500 (summer 1985); then, MEXICO with numbers was abandoned (from spring 1984 Eddy Merckx was no longer a record holder in an hour's ride on the track - in the end someone noticed it . Beautiful frame btw - Jacek