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By using the fourth character as an extension of the last three, the serial numbers could be extended from 2600 possible combinations to 26,000 for a given month. Serial numbers for four model 510 frames (with a leading F) have been reported that have similar unexpected year dates.
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.
This applies only to serial numbers in the form LNLNLNN where the first letter is an O (Oh).
This does not apply to the all-numeric serial number form that began in late 1980. For these all-numeric numbers with a leading zero, see LATE 1980 to LATE 1986 below. It appears that some custom frames were built that did not fit within the standard model description. The last three characters - The final letter ranges from A to Z and the final two numbers go from 01 to 99. Perhaps once Trek was nearing more than 2600 bikes/frames of a given model per month, a new serial number scheme needed to be developed.
Just remove the plastic cable guide to see the number.
The other place Trek (or their subcontractors) stamped the SN is at the lower end of the seat tube.The frames have the early TREK graphics on the seattube.These frames may be related to the M and N leading serial number bikes in the section above. Trek used this form of serial number (leading O "oh") for their custom-made 950 frames.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.Another small mystery; for now we'll call it a 310.Tags: Adult Dating, affair dating, sex dating