P6 Z570 - year of manufacture 1984; at that time, EMC produced Professional (Columbus SL/SP or Reynolds 531 tubes), 3-Athlete (Reynolds 501) and Pro (Columbus SLX/SPX or Reynolds 753) models. Only one of them had "its" designation - Professional R531: on the left side the letter R. The 3-Athlete model has 2 unique features: dropouts of a different shape than Campagnolo, with "Eddy Merckx" and BB cover without recesses (4 or 6) or with cutouts =. There are no 'riflings' inside the steering tubes and it has... seatpost 27 (or 26,8). The Pro 753 has no riflings, no chrome-plated tubes and is extremely lightweight. Models built with Columbus have "riflings", Professional has always had Gipiemme "cube" brake bridge, Pro almost always has Silva brake bridge. The surest confirmation for SLX/SPX is to see the tube ends visible inside the BB cover - all should have "riflings". Some photos could help Vitus cable guide is characteristic for EMC 1984 frames (it was an option), most often it appeared in Professional and 3-Athlete.

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