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TX700 frames were available as special order, with Columbus tubing instead of the specified Reynolds 531. However, this model did not appear in any of the Trek brochures on this site. Serial numbers beginning with M or N (41X and 61X bikes or frames) seem to have a different meaning for what normally is the year digit.The year digit is the fourth character in the number.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.
These serial numbers apparently do not follow the year convention used for other Trek models.
In the 50 M and N serial numbers that have been sent in by owners, the year numbers go from 0 through 9.
The remaining part of the serial numbers seem normal.
The dates coded in the serial numbers, or the dates inferred from the numbers, are dates on which the new frames were stamped with serial numbers (serialized).
These dates are not necessarily the same as the model year of the frame. I have included a photo of the results from my bike.
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Trek frame serial numbers (SNs) are typically stamped into the bottom of the bottom bracket shell.