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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.
Just remove the plastic cable guide to see the number.If you own an MK1 Chopper, an early MK2 Chopper or a Chopper Sprint, youre stuck with the rear hub date as identification, All sprints were produced 1972 1973. although they usually fall within a production run of only a couple of years depending on model.... All MK1 and most MK2 up to late 1972 have their frame numbers stamped on the left rear dropout.These early models had the frame number consisting of seven numbers... This is the bit of flat steel that the rear wheel bolts into, on the other side to the chain.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.A couple of serial numbers have been submitted that are missing the first letter. For example, a 710 frame made with Columbus tubing instead of 531. The last letter might be a run designation, with the last two numerals the frame number in that run? Hence the change to the sequential system that was started in late 1980.