Ours was a 50...more chrome on the dashboard than my F-150 has on the bumpers. Ours was black and as a child I felt pretty safe in that huge back seat, way down below the windows on the soft horse hide cushion. We went on lots of rides with my grandparents in that car, I have a photo of grandpa standing beside that beautiful shiny dreadnaught. The one in Driving Miss Daisy was a maroon Ambasador.
Those were indeed fun days to be young and driven around in style.