Since Bob hasn't seen the data plate question yet, I'll field it: For a 1941 convertible coupe, it should show: Model 41-6267D (Year-SeriesBodyStyleDeluxe which all convertibles were). Of course, if it's a closed coupe conversion it could have a reproduction data plate with the convertible body style on it. If the data plate shows: 41-6227 or 41-6227D, the car was originally a closed coupe.