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Therefore, a bike with frame number ND46057 Would have been produced at Nottingham (N) in March (D) in 1974 (4) and be frame number 6,057 produced that month.Trek frame serial numbers (SNs) are typically stamped into the bottom of the bottom bracket shell.
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This was made by the individual framebuilder to mark his/her work.
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.
The other place Trek (or their subcontractors) stamped the SN is at the lower end of the seat tube.
Many early Trek bottom bracket shells have a one or two letter code stamped separately from the serial number.
If you know which mark was used by a particular craftsman, please let me know.