Duesenburgs

Arlington Sedan body by Rollston, described by the factory letter below

 supercharged, body by LaGrande

convertible sedan with glass partition between passengers and driver, body by Rollston, cost 17 thou when new, the most of any car at the show it was debuted at

 wow. If you have to impress an audience with a car, this would be the one

transformeable phaeton

found while digging through http://digitalgallery.nypl.org/