While Sears did sell some decent bikes that were likely made by Puch in Austria, the vast majority of the Sears bikes sold during the '70s and '80s bike boom were those trashy US made bikes that were then the staple US discount stores. Looks like they were made by Murray, Huffy, Columbia or someone of that ilk: seamed welded tubes, crimped dropouts, Asthtabula-style cranks, crappy wheels, low end Shimano/Suntour shifters, etc.