[Lamar Wadsworth]

Another thing to consider is that not all optional equipment was installed at the factory. Basically the older the model, the more likely that any options were dealer-installed. Any dealer-installed options would not be noted on factory paperwork. By the mid-50s most options were factory installed. Something like backup lights on a mid-'50s Ford, or a radio in a truck, outside mirrors, etc. was often dealer installed. Prior to WWII, most options were dealer installed.