This is a used 31.6 thomson 'elite' non set back seatpost. It's scratched in a few spots - shown below. 410mm cut to 350mm with the 'max' mark located for the new length, Still has plenty of life, please call:
dennis at 503.860.2095

Picture at:
http://portland.craigslist.org/mlt/bik/1253431792.html