Shell Oil medallion

1975? Starting in the 1960s, customers who filled their vehicle up with gasoline at a Shell Oil station in Canada would receive a free promotional medallion like this one. These medallions came in various themed series - to collect them all, you would need to keep going back to Shell Oil stations. The Prime Minister series were made out of zinc plated with a thin layer of brass. But, almost always, the brass layer is found missing, leaving nothing but zinc. According to: en.numista.com