Vintage Idaho Gasoline Porcelain Sign. Add a piece of Gasoline memorabilia to your gas & oil collection with this vintage porcelain Idaho Gasoline Sign. The beautifully designed native American Indian Chief Gas Pump Sign is a must-have for any advertising and collectibles enthusiast. Made with porcelain this sign measures 12 across. This sign features Washington / Idaho as the brand type. This sign will enhance your mancave, collection, shop, or garage. It is your chance to own a piece of Idaho advertising. Native American Indian Chief. 12 inches in diameter. Vibrant colors and excellent porcelain.