I have no clue about this card, but the bastian of truth that is Wikipedia tells us the following (below) about S.S. Kresge stores. The Detroit connection fits nicely with your card but it obviously goes without saying that there is nothing preventing someone who is making a fantasy piece from typing something relevant on the back. Good luck in your search, I hope you turn up some good news.
"Sebastian S. Kresge, the founder of the company that would become Kmart, met variety store pioneer Frank Woolworth while working as a traveling salesman and selling to all nineteen of Woolworth's stores at the time.[8] In 1897 Kresge invested $8,000 (equivalent to $227 thousand in 2015) saved from his job in joint ownership with his friend John McCrory of a five and dime store in Memphis, to which they added another in downtown Detroit the following year; these were the first S.S. Kresge stores.[9][10][11] After two years of partnership, he paid McCrory $3,000 (equivalent to $85 thousand in 2015) and gave up his share in the Memphis store for full ownership of the Detroit store, and formed the Kresge & Wilson Company with his brother-in-law, Charles J. Wilson.[10][11]. In 1912, Kresge incorporated the S.S. Kresge Corporation with eighty-five stores."
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https://en.wikipedia.org/wiki/Kmart#Early_history)