1930s Original HECCOLENE GASOLINE ~ HELENA MT Metal License Plate Topper Sign. Says HI-POWER GASOLINE ~ H EARL CLACK CO ~ HECCOLENE HECCO OILS ~ HELENA. Stamped ERICKSON DES MOINES. Came from HELENA, MT. Measures 10 X 5 inches. Check out photos. Be sure to take a look at my other old signs and advertising. Thanks!