Just to clarify a bit on what Tom and jimmo said about wheels. Rust happens fairly quickly it's true, but on wheels with roller bearings. Most of your equipment is going to have plain bearings in 1950. The plain bearings grease tended to get all over the wheels pretty quickly and caused all kinds of filth to stick to them. That coating of greasy filth also tend to prevent rust.
As far as the paint goes, obviously the paint and lettering would be in good shape, but as jimmo points out "It also depends on what kind of weather and environmental conditions they have endured in that period of time". So use your own discretion there. Dirt on a car in good shape will look "weathered" but not in the same way as a car with old, and failing paint.