Are you talking about the models around '40? From what I've read different grilles on standard, business and opera with opera being the flashiest. Business had front seat and a massive trunk with storage behind the seat for sample cases, catalogs, etc while the opera model had little jump seats facing each other, and rear quarter windows that were hinged on the front to tilt out. More chrome and trim work on the opera coupe. Maybe someone like Uncle Bob can chime in here - I think he may have been an original owner of an opera coupe?