Another look for me is what appears is a rub rail trim midway up the rear corner. I can't help you with that. It may be to cover some minor damage. If it isn't repeated on the streetside it was definitely added. You could duplicate it on the streetside if it bothers you. I would not consider removing that trim, however.
Neil and Lynn Holman
Kirk Creek, Big Sur, Ca. coast.
1966 Trade Wind
1971 Buick Centurion convertible
1969 Oldsmobile Ninety Eight