You know what I suspect? The car is actually a base 732-series Beaumont. Look at the steering wheel. Also the interior door panels clearly are reproduction versions without the bevels, and the lack of medallions suggest that there were none to take off and reuse from the originals (because it was a base model rather than a Custom series). The lack of side trim usually means that a molding clip broke during a repaint, but it can also mean that it was a base series car that never had them to begin with. Only an even 100 of the 732-series convertibles were built for 67.