I used to visit my grandparents (in Chicago) in the summer as a child (early 70s) and I recall grandpa coming home from the gas station once a week with little 3-diminsional collectible pieces the portrayed world flags about the size of the ol' s&h green stamps. Mom says he always shopped at the local Standard Gas Station. Do any of you recall this promotion and more importantly, do you know anyone selling their collection of these?