My bad. I didn't even notice that the visor wasn't installed in your first photo. Old age and old eyes.
Below are four pictures I got on the web. Left click on them for a larger view. All are supposed to be 1928 models. One of the chopped sedans and the stock sedan appear to have the visors straight. The other chopped sedan and the sport coupe have visors that appear to be slightly bowed.
The picture of Henry's that you like is of a 1930/31 coupe and has a different style visor.