The 'coupe pillars' were Henry's son Edsel Ford's (head of FORD Styling Dept.) effort to bring the NEW FORD into a more contemporary and 'chic' mode of styling. The forward curving, distinct 'pillar' was all the rage in Europe and was called a "French Curve". Edsel traveled extensively in Europe and incorporated as many modern stylistic features as he could 'squeek' by his more somber and staid father. (See Edsel's custom-bodied Pheaton).
Other American marques of the time, especially the up-scale ones, used many European stylistic features, including the 'French Curve', to help give sophistocated 'panache' to their styling. Edsel, with the 'French Curve' of his newly designed Model A, was just following suit with many of the other marques of the time.
There was a much stronger 'definition' and a more pronounced 'French Pilliar' in the Ford Model A closed cars of 1928-'29 than can be seen on the open cars. FORD only used this feature on FORD-made cars, while outside body builders like Murray and Briggs (4-Door Sedans, Cabriolets, etc.) did not.
This design feature did add a bit to the manufacturing cost, and as it was 'frill' rather than function, with the financial crunch of the Oct. '29 beginning of the Great Depression, this extra 'frill' was omitted in the design of the new bodies of 1930 & '31.
- Doug Vieyra, Docent of the now closed EUREKA FORD PLANT.