Given it's scale, I would guess it is showing the Michigan, Ohio, Southern Ontario portion of a Petroleum Company's Gas Station giveaway map, or AAA driver's folding map of The entire USA from the early 1960s. The State of Michigan is too small for it to be an individual state map of Michigan, and way too much of an area is shown for it to be a map of The Detroit Metropolitan Area. Yet, not enough is shown for it to be all of North America.
It's exactly the scale of the gas company and AAA driving folding maps of USA. Actually, when I was young, i compared such maps to the map on the label, and the areas of southern Michigan and northern Ohio matched up, exactly. Those maps were made by Rand, McNally & Co. The map on the label can be matched up by the run of maps that used contour lines on the outer edges of lakes and the oceans. Of course, the big star atop Detroit was put there by Motown, and was not on Rand, McNally's maps.
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