Fillet brazed frames were built by Schwinn through '83 in Chicago and at least up till '89 in Greenville MS.
I'm not aware of other filet brazed Schwinn lightweight offerings after these described below.
Aside from the limited run of 28" continental's which is a factory custom of sorts because electroforged components were not produced for the head tube for a frame of this size. But this couldn't be described as a filet brazed frame in the traditional sense.
This is wrong?
"Schwinn bicycle names such as "Super Sport" and "Superior" have been re-used for different models over the years, in part to hold on to copyrighted names by periodically re-using them. This may explain why the Sports Tourer was renamed the Superior in 1976. After Schwinn's fillet-brazed line came to an end in 1978, the "Superior" name went on to be used for the so-called "baby Paramount." That Superior was a Paramount frameset (
lugged) with Campagnolo's lower-level Gran Sport component group and a bright orange paint job."
"Schwinn's Chicago handbuild shop was closed in 1979 and production of the Paramount came to a halt at that time. Paramount production resumed in Waterford, Wisconsin in 1981."
In 1979 Schwinn offered one last fillet-brazed
CrMo bicycle: The "Sport Limited." The Sport Limited was sold to use up a supply of Super Sport frames that Schwinn still had in inventory. It was available only in a Scarlet Red color, in both women's and men's frame designs. About 1000 Sport Limited's were made and sold to Schwinn dealers for resale as they saw fit. A factory-suggested retail price was not given, and the Sport Limited did not appear in any catalog. The Sport Limited used wheels and other parts from the fillet-brazed Superior. An interesting feature of the Sport Limited was that although the frame had an Ashtabula bottom-bracket shell for one-piece cranks (like the Super Sport), a conversion bottom-bracket spindle was used to fit a "Schwinn Approved LeTour" aluminum-alloy
cotterless crankset.
The technology of Schwinn's fillet brazed models has been eclipsed by today's bicycle frame, shifting, and braking technology. And the strategy of fillet brazing has been eclipsed too. But it is worth remembering this peculiar little chapter in the story of
Chicago Schwinns.
Information for this article came from interviews with members of the Schwinn Bicycle Company (conducted in 1989), Schwinn Consumer Relations, the Schwinn History Center in Chicago, several Schwinn Bicycle Shops, Schwinn catalogs, and Mr. Robert Evans. Special thanks to Mr. Jim Hurd.
http://www.sheldonbrown.com/schwinn-braze.html