Someone that lives in my block saw I had a track bike and so he invited me over to his app and showed me two track bikes that he wants to get rid off, one is a Lejeune, the other one is a Durkopp. I'm not very "connaisseur" of these brands and could only find few informations on the web. He said he would sell those frames for very cheap. I know you guys must know about those bikes. They are not complete but still. The frame are in ok shape. Let me know if these are valuable frames.