Collector's Series championship

Does anyone know which cars qualify for the “Collector’s Series” championship? I’ve got the Koenigsegg ONE:1 and the Maserati A6GCS/53, and I know there’s the Alfa Giulia, but I’d love to know what else counts as a “Collector’s” car?

When you are over the icon, you can hit x or y (I forget which at the moment) and it’ll show you all eligible auto-show cars for the series.