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.
Trek frame serial numbers (SNs) are typically stamped into the bottom of the bottom bracket shell.
In the case of some early 80s Treks, the number is under the plastic cable guide on the bottom of the shell.
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.
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