Doesn't look like there is much on there that is newer than the 40's. I'm guessing that the plates are Year Of Manufacture(YOM) for the car. Technically it would be more accurate to have, say, 1940 or thereabouts, license plates, but those sure look better than something modern.
Nice pictures what color is it looks like it mite be the old hot rod black primer which would be what they put on alot of old cars and street rods back then I remember back in the early 60'S when I started working in my Uncles body shop we would sand 55 chevys with good paint on them and spray them with Hot rod black primer