I have a feeling that the rear hub will be Shimano (solid bell crank with a pushrod coming out of the axle rather than a chain and pullrod) - I don't remember any Kmart bikes using Sturmey Archer. It's definitely bike boom vintage, can't really narrow it down to a certain year, and I'm fairly certain the bike was made my Murray for the Kmart company.
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Syke
“No one in this world, so far as I know — and I have searched the records for years, and employed agents to help me — has ever lost money by underestimating the intelligence of the great masses of the plain people. Nor has anyone ever lost public office thereby.”
H.L. Mencken, (1926)