I distinctly recall something about a "TSI" stamping on the BB shell of bikes Tim built. Maybe [MENTION=20548]JohnDThompson[/MENTION] can confirm?
I know I've seen pictures of it, but I'm having a heck of a time finding anything now I need it
Ain't that just the way it goes?
Edit²: Got the initials wrong.
Edit³: And apparently my assertion was wrong, per the Vintage Trek site, pertaining to '80-'86 models:
Originally Posted by Vintage-Trek.com
Some early and mid 80s bottom brackets were marked with 58TSI or 60TSI. In the early 1980s Tim S. Isaac designed new lugs and a new bottom bracket shell for Trek. The new bottom bracket shell is typically marked with 58TSI (or more rarely, 60TSI). This designation is not part of the serial number but is a model number of the shell. The TSI are Tim's initials. The 58 or 60 refer to the angle between the seattube and the downtube.