Probably should have added in my prior post that if the car didn't come with a safety feature, you don't have to use or add it. You go back into the 50's and things like signal lights and outside mirrors are options. If the car didn't come with signal lights, you don't need to have them.
She mentions that nobody believes her when asking whether it's a restoration or original. Guess we can add one more.
I know of a '50 Chevrolet that was garage-stored and driven sparingly, it looks just as good as that '57 inside and out, and is almost a decade older, and we're talking Canadian winter conditions thrown in there, and yes the owner drives it in winter. I know the original owner and the current, second, owner. There's about 80,000 miles on it.
It's never seen any restoration work at all. So, I know it's possible that this car *is* bone stock original. Biggest thing is to wash the car weekly, wax it, do an oil undercoating every couple of years, and it's possible. Keep it clean and even the upholstery will last ... the fabric only wears when abrasive particles are allowed to embed.