I am not sure what you mean by "At some point don't all seatposts have limit lines?" What do you mean by "point"? Do you mean point in time, or a point of location on the post? In either case, Campy didn't stamp limit lines on their seatposts until the later '70s, with the introduction of the Nuovo Super Record (2nd Edit.) seatpost. So therefore, if your seatpost has a limit line, it would have to be a 2nd Edit. SR/NR/G.S. (assuming we are talking about classic Campy, not the more modern stuff from '84 on).
> In a message dated 11/25/00 1:37:52 PM Eastern Standard Time,
> email@example.com writes:
> > Here is a little more info for those of you out there that care: The Gran
> > Sport post is the same as the old Rec. post, EXCEPT the G.S. has a limit
> > line, and its fixing nuts (#703) have the inside beveled ends as opposed to
> > the inside radiused ends. The stampings, brackets/supports, and finish are
> > the same as the old Rec. So for all intensive purposes, once the post is in
> > the seat tube, 99 % of Campy enthusiasts would be fooled.
> I must admit I've been unable to decide with any certainty what my model my
> seatposts are.
> Q. At some point don't all seatposts have limit lines? I'm not sure how I
> could use this to ID a post.
> Pete Geurds
> Douglassville, Pa