If you look at the 1980 catalog page, you'll see "Designed by Schwinn's sophisticated cycle engineers and built to Schwinn's exacting requirements..." That's code for "imported", and suggests it was either built in Japan or Taiwan (Giant). Production in Mississippi didn't start until mid '81, and although they were building Le Tours and Super Le Tours in Chicago in 1979, the "built to Schwinn's exacting requirements" means it wasn't built by Schwinn.