While the sign reads “approved”, to me this particular sign does not look like Willys approved signage. There are too many signs of slight overspray. Perhaps it was done by a service station owner? I’ve also not seen one with that background color. Anyone seen another like this?
https://toledo.craigslist.org/clt/d/toledo-vintage-1950s-s-willys-metal/7119346029.html