+1 on lower mid range, probably late 80's. Might have been made by Giant in Taiwan. They had enormous output and made very well constructed bikes for the price. All the late 80's Schwinn world sports and travelers, and possibly even the le tours were made by Giant, and they also built for Centurion, GT, Nishiki, and many, many others. See if there's a made in Taiwan sticker on it. That might give a clue.