Looks similar to a Higgins. Front has a painted on badge- looks like "aero wind" or something. Here's a few pics:
I bet it was this one...
The wrap-around tank/light would explain the ghost-line present on your headtube, as well as the lack of a true badge. By this point, Sears had already abandoned the JCHiggins branding. The Aerowind decal, while obviously old, may not be original to the bike.
Mercury Fleetwing.
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