I now see that the seat stay ends are partially wrapped around the front of the seat tube. Is this a fairly normal feature for Motobecane frames, and was it used on a specific model(s) within a limited time frame. It would seem that combined with the lug work it would help in dating this frame. I guess I'll have to "bone up" on that marque. Would this be considered a better frame by Motobecane? I don't know the tubing nor weight. I have checked the seat tube for any apparent honing, reaming, and/or any other means of enlarging the bore; none are discernable. The Campy seat post is in an unaltered condition, it clearly shows the stamp for 26.8 mm size. I will say that I have not physically mic'd the ID or OD of the seat tube, or the post OD. Curious to see what the BB threads are.