bpatrick said:There was no such car as a Porter (what Ann Sothern's character
was supposed to be), 1928 or otherwise, so it's probably no accident
that the car was culled from parts of real cars.
There were actually two cars known as "Porter's" although neither bore any relation to the car in the series:
The “1928 Porter” used in “My Mother the Car" was not a production car. Real Porter cars had existed: The first was a steam automobile (Boston, Massachusetts, 1900–01). The second car was a powerful luxury car made (Bridgeport, Connecticut, 1919–22) made from parts left over from production of Finley R Porter’s FRP.
http://en.wikipedia.org/wiki/My_Mother_the_Car