I was originally thinking the Cord with the Jada Cobra wheels, but those things are huge!
Digging through my stash I found a Matchbox 1/32 Mercedes SSK and Packard Victoria and a 1/48 Renwall Packard that might be good candidates. Plus their odd scales might add to the interest. I also ran across a Lindberg Auburn Boattail. I'm going to have to go through my boxes to see what else I have that I've forgotten!