Many early Trek bottom bracket shells have a one or two letter code stamped separately from the serial number.This was made by the individual framebuilder to mark his/her work.
This Streamliner is owned/restored by Nathan Pence and was painted by Dave Stromberger. The 1937 Roadmaster Supreme is one of the most desirable pre-war bikes.
and badged as a La France, this streamlined, art-deco styled bicycle was a top-of-the-line machine, even though it didn’t feature a tank… It features the motorbike style frame with truss fork, Persons leather saddle, cross brace handlebars and of course, a Miami built….
Each seven-character number consists of three letters mixed with numerals.
The serial number list and the code for the list are not available from Trek (but hope springs eternal).
In the meantime, we have the results of the serial number decoding project:). This letter may also have been used for custom 750 frames.
If you have a leading O (Oh) serial number on a frame with Reynolds 531 stickers, please contact me (Skip).
On some bottom brackets there are two codes: one indicating the maker of the main triangle and the other for the maker of the rear triangle or perhaps the person who cut and shaped the tubing, if not done by the framebuilder.
If you know which mark was used by a particular craftsman, please let me know.
According to the brochures, Trek did not make 41X and 61X bikes or frames during 76, 77, 78, and 79 and also not in 83, 84, 85, 86, 87, 88, or 89.
These serial numbers apparently do not follow the year convention used for other Trek models.
The trademark “Merkel Orange” is accentuated with maroon head and gold pinstripes.