1947-50 (my '50 came with Phillips type, original owner truck, this has been debated ad nauseum).
https://www.flickr.com/photos/advance-design_parts_co/17057160050/in/album-72157651722976780/
https://www.flickr.com/photos/advance-design_parts_co/9110621847/in/album-72157631868452754/
51-55 1st style rivets
https://www.flickr.com/photos/advance-design_parts_co/8130552154/in/album-72157631870734114/
I thinking checking would need to be defined, owners, auction houses, law enforcement, who exactly? I have owned 32 of these in various states and never had one inspected? Titles can be replaced entirely by mail where I live, can the plates be switched, sure, can you prove it, that is another post.