Joe Lemanski replied, I saw a Swift with flat plate tips at the now long deceased McKinley airport in the NE suburbs of Detroit about 1976.
Could this be it?

My Swift has exactly these wing tips installed at this time (I have the originals and they will be installed) which was how I acquired it. The last paint job on the aircraft was a World War II faux camo job (yuck) and under that was a white paint job with red accent strip about where I see it on the picture. My aircraft was rescued from Upper MI at a small grass strip near Sault St. Marie.