Back in the early 1980’s , Trek was a small Bike manufacturer in Wisconsin that had great quality products for a reasonable price. in 1981 was the last year for the Trek Logo on the seat tube without the contrasting panel of color behind it.
this is a 613 model. It had Reynolds 531 main tubes with Ishiwata fork and rear stays. The fork was a issue, it was built in such a way that it would cause one or both of the fork blades to break. this bike in the picture has the original fork, although since then i have replaced it with a Chrome Tange fork.