Several factors confirm this date: The Date: The Indy 500 is traditionally held on the Sunday of Memorial Day weekend. May 28 specifically aligned with that Sunday in 1978, 1989, and 1995. The Pace Car: 1978 was a landmark year for the race because the Chevrolet Corvette served as the Official Pace Car for the first time. This event was heavily marketed with "Official Pace Car" merchandise and dealership banners like this one to promote the Limited Edition Pace Car Corvette. Design Style: The typography (specifically the serif font and the red/black color scheme) is consistent with late-70s automotive promotional materials. Banner is promotional thick paper for dealerships. View photos carefully.
