I sent an e-mail to Trek and asked if they could decipher the serial number, N4F2CXX. They could not identify it from the serial number and asked for pictures of the drive side, down tube, head badge, derailuers, decals, and tubing sticker. From the pictures attached below (right click and open in a new window) they said it's a 1981 Model 613. The serial number decodes as a 1982, but ???
