Eric, it might also be the act of an over zealous prep man in the factory "falling asleep at the reamer". One other note, I have two identical, NOS 26.6 steel Simplex seatposts in my stash. When a caliper is put to both, one measures 26.58 and the other 27.00! To quote a line from "Chariots of Fire", "They're a peculiar lot, the frogs".
PS. For the record, my marked 27.0 steel post measures 26.85.
>Riddle me this Bike-Friends.....
>My 1968 Peugeot PX-10E has an original 26.8mm Simplex seat post
>My 1972 Peugeot PX-10E has an original 26.4mm Simplex seatpost
>My 1977 Peugeot PX-10LE has an original 26.6mm Simplex seat post
>All three have Reynolds 531DB French decals, all three have 1/2 chromed
>Why would they have three different seat post sizes????????????
>Eric "always finding something to keep me perpetually confused" Elman