WWII gas ration sticker placement?

[Ol' Ron]

My Father worked for a company that installed stockers, and oil burners in factories. So he used his car every day, always had gas and tires. Out Neighbor was a French man who was in the first world war. He called the police and reported him. It became a family joke. My Dad was a black marker supplier????? He worked 10/12 hrs a day keeping the factories running. Many people did this, unsung heros