Picked up a 1927 British Columbia plate and an old Standard Oil license plate topper recently on E-Bay. Correct me if i'am wrong, but from the little research i have done, it seems the Standard Oil topper was given to customers to try out the "new" leaded version of their gas. Lead was not in gasolene originally and Standard Oil wanted to see how it would perform in everyday use. The Topper has a registration number stamped into it to register that topper to a certain customers car. I'am guessing late 1920's this test was conducted? If anybody has more info on this i would be interested to know.