I'm gonna take a stab at this and say zero. I say that because it is MUCH, MUCH, easier for machines to do the work for you and on top of that vehicle demand is much too high for production to be done by hand.
I remember: Ford, GM, and Chrysler models
Nissan cars are manufactured in these countries:AngolaBrazilChinaEgyptIndiaIndonesiaIranJapanMexicoPhilippinesSpainTaiwanThailandUnited KingdomUnited States
There were many makes made during the 1940's and they all had several models. Check this site, http://en.wikipedia.org/wiki/Category:1940s_automobiles
Daihatsu offers four different models of vehicles. The Sirion, Gran Max, Terios, and seven seater Terios' are all precisely manufactured by Daihatsu.
They're manufactured in the United States.
cars are manufactured by an assembly line
Pontiac manufactured the Solstice, Sunbird and Sunfire model cars. Rolls Royce sold the Silver Shadow model. Dodge sold the Shadow and Spirit models. Plymouth sold the Satellite and Sundance models.
Toyota does manufacture convertible cars. The Camry Solara & MR2 Spyder models are examples of convertible cars manufactured by Toyota.
Aveo cars are compact models that are made and manufactured by the Chevrolet corporation. These cars can typically be purchased at Chevy dealerships and in some cases, at used car lots.
The company that makes Escalade cars is known as Cadillac. They manufacture several makes and models of this car at various prices depending on what you require.
The Allroad class of vehicles is manufactured by the automobile company Audi. There are many models of the Allroad vehicles, including new models which debuted in 2013.
Volkswagen makes several models of cars that are sold. Some of the most popular models sold in America are the Jetta, the Passat, the Golf, and the Bug and Bug Convertible.