|Chrysler, Saturday Evening Post, Dec 8, 1956|
The headline under the drawing of the car speaks for itself :-)
The emphasis is on technical improvements: a new suspension system, new transmission, smaller wheels with bigger - and low-pressure - tires. Luckily there are also "exquisite new appointments and interior conveniences [that] will delight a lady's heart".
This ad supports our preliminary findings that there is a peak in the occurrence of the word 'modern' in the 1930s and 1950s. But we will have to do more research to substantiate that claim and will get back to that later this year.