Originally Posted by TheOtherGuy
No idea about the letter M. I'll take a look at my late Super posts tomorrow & see if they have different letters... That may be a way to date 'em.
a scan of my seatpost database shows two with M's, both with beacblasted collars. I'd never noticed the M before. The posted picture is of a later (90's) post, polished all of the way to the top...is a mystery...