According to a posting by one of the framebuilders, reaming of seattubes was a very widespread practice by many builders, which is precisely why you can't dependably tell the brand and grade of tubing from the seatpost size.
Regards,
Jerry Moos
Joseph Bender-Zanoni wrote:
> Especially for a Windsor, anything is possible. My Windsor track bike,
> which was, all in all, the best handling bike I have ever owned, had the
> seatpost reamed after the bottom bracket was installed with resulting steel
> chips in the Campy Record BB. One pedal around the block and it would have
> been ruined. Luckily I decided to tear the bike down to every bearing out
> of the box and caught it. It is really amazing because you could always
> ream the bike upside down for a half ass fix and the bike had perfect
> handling, alignment etc.
>
> Joe