There was a thread on the "Super Sport" with the Columbus Tenax frame. No consensus on whether these frames were made by Panasonic in Japan, or by Schwinn in Mississippi. And, there was a vote or two for Giant in Taiwan.

The debate would be unnecessary if there was a country of origin decal on the frames. In that era, a "Made in USA" decal was normally placed under the clearcoat, so that it was permanent. "Made in Japan" decals were often stuck on with a short-lived glue...so they fell off somewhere after clearing customs in Long Beach, but prior to being displayed to customers in the bike shop.

The fact that no Bike Forum member has posted to say that his Schwinn Columbus Tenax frame has a "Made in USA" decal would cause me to vote: "Made in Japan" by Panasonic. And, Panasonic made nice bikes.