This was made by the individual framebuilder to mark his/her work. Many early Trek bottom bracket shells have a one or two letter code stamped separately from the serial number. Sales persons sometimes had difficulty reading the numbers. Note: The SN on your original sales receipt may not match the one on your bike. The other place Trek (or their subcontractors) stamped the SN is at the lower end of the seat tube. Just remove the plastic cable guide to see the number. In the case of some early 80s Treks, the number is under the plastic cable guide on the bottom of the shell. Trek Frame Serial Numbers|||| Serial Number Location Trek frame serial numbers (SNs) are typically stamped into the bottom of the bottom bracket shell. Late in 1980, Trek changed to a sequential. Prior to late 1980, Trek used an alphanumeric serial number scheme.
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