Good detective work Matt.
John, the bottom 4 holes are for a plastic pump plate (like Matt pointed out). Originals pop up often for sale and they aren’t expensive. They also used decals of the same design, if you want to go that route.
-Steve B. (WTB: 48" Flying A button, 48" black/org Phillips 66, White Star, and Chevrolet Signs. Also looking for a Wayne 866. Send a PM. Thanks.)