Originally Posted by T-Mar

Often catalogs don't illustrate the female version s and even if they do, they're not always accurate. Here's a fixie/SS version of a 1985 Traveller with a "Sport" style frame. It has the distinctively positioned down tube cable stops of the OP's frame and the fork even has the recessed brake mount. The axle retainers have been ditched but is you look closely, there's a kickstand without a clamp plate on the top of the chainstays, so it obviously had a welded kickstand plate. The one descrepancy with the OP's bicycle is the presence of a derailleur hanger, though that could be because it one step up the hierarchy ladder. Regardless, it proves that Schwinn did use this frame in the 1980s.